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Troubleshooting Electrical Problems
 
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Pelican Technical Article:

Troubleshooting Electrical Problems

Time:

As long as it takes

Talent:

***

Tools:

Multitester

Applicable Models:

 
Porsche 911 (1965-89)
Porsche 912 (1965-69)
Porsche 914 (1970-76)
Porsche 930 Turbo (1976-89)

Parts Required:

New fuses

Hot Tip:

Do some preliminary checks first, and then make a battle plan for isolating the problem

Performance Gain:

No more electrical gremlins

Complementary Modification:

Install/replace light bulbs, fuses, relays
101 Projects for Your Porsche 911

This article is one in a series that have been released in conjunction with Wayne's book, 101 Projects for Your Porsche 911. The book contains 240 pages of full color projects detailing everything from performance mods to changing your brake pads. With more than 650+ full-color glossy photos accompanying extensive step-by-step procedures, this book is required reading in any Porsche 911 owner's collection. See The Official Book Website for more details.

One of the most common problems with older cars is the existence of intermittent and annoying electrical problems. Example: a dashboard light goes on when you hit the brake, but only when the rear defogger is on, or the radio only works when you are in reverse. As bizarre as it sounds, electrical problems like these are very common on these older cars, and unfortunately, they can be quite difficult to fix.

What typically goes wrong with the wiring on these cars? There are several things that can happen. First and foremost, every time the car is sold to a new owner, there is a high chance that they will do some modification to the wiring that only they will know about. The installation of a new stereo, power mirrors, a radar detector, or the worst of all, an alarm system, can seriously mess up your wiring configuration if not performed correctly. You're left holding the mess, armed with only a few sporadic clues as to what is causing the problem. Troubleshooting electrical problems is a tough chore, and one that most automotive repair shops will not perform without telling you they will charge you their $80 an hour diagnostic fee.

This project will give you some tips for troubleshooting your electrical system, but it's not meant to be a step-by-step guide for fixing all of your problems. That would take almost as many pages as are contained in this book!

The first step in troubleshooting is to make sure that you are armed with all the information that you can get. Namely, the most important item you need to get your hands on is a copy of the electrical diagrams for your year car. At the time of this writing, they are available from a few sources. Check the information sources section in the front of this book for more details. These diagrams are essential for troubleshooting electrical problems.

One of the most common problems is the continuous drain on the battery. One example would be a situation where you leave the car sitting for a week or two, and the battery becomes completely drained. This means that something is "on" inside the car at all times bleeding the battery of power. Start by disconnecting your battery ground, and connecting an ammeter to the battery negative and to the chassis. The ammeter will show the amount of current that your electrical system is draining from the battery. When you hook the meter up, it will most likely show that there is some small current flowing through the system. Don't try to start the car or turn on too many electrical accessories, because this might blow up your meter. Disconnect the front luggage compartment light before beginning any testing.

Now, move to the fuse box in the front trunk, and start removing fuses. See Project 26 for a picture of the fuse box located in the front trunk. Carefully watch the ammeter to see if the current drops to zero when a particular fuse is pulled. If it does, then you have successfully isolated the electrical circuit with the problem. You are more than halfway to solving your problem. Look at the electrical diagrams and you should be able to tell what components are located on that circuit. Try disconnecting each one, while watching the ammeter, and you should find the culprit.

If pulling fuses doesn't reveal anything, try pulling out the various relays. Sometimes a relay will be powered on, but the device it controls will be disconnected. This may lead to gradual battery drain. One example of this is the heater levers in-between the seats that control the blower motor in the engine compartment. If the blower motor is disconnected, but the levers are pulled up, the relay will be activated, and the battery will slowly drain down.

While we're on the subject of wiring diagrams, in 1975 Porsche switched from using typical voltage wiring diagrams to using what is called a current flow diagram. How do you read a current flow diagram? It took me a little time to figure it out. Look at it this way. Imagine that you are looking at a diagram that shows waterfalls emptying into a lake. At the bottom of the page (electrical ground), it is similar to a large lake that the waterfalls empty into. At the top of the page (high voltage potential) it is similar to the top of the cliff, right before the waterfalls off the edge. Each path that the current diagram shows can be interpreted as a separate waterfall that turns a small turbine and generator as it falls down into the lake. The electrical accessory can be seen as the generator. The battery of the car is similar to a pump that pumps water from the lake back up to the cliff.

After you get used to them, you will undoubtedly find that the current flow diagrams are much easier to read, primarily because they separate circuits from one another. You don't need to look at one circuit that you don't care about, just to find an electrical fault in another. The current flow diagram can tell you everything that you need to know right away.

Another common electrical problem is the device that just won't work. If you carefully look at the electrical diagrams, you will notice that there are actually six points of failure for most electrical devices on the 911. For lack of a better example, we'll use a blower motor to explain and demonstrate the electrical troubleshooting process.

Starting from the rear of the electrical chain, the first point to be concerned about is the actual device itself. You can start the troubleshooting process by testing the motor. Unplug it and apply 12V DC to the blower motor to see if it will turn. It if doesn't then you have a problem with your blower motor.

While the motor is unplugged, another excellent test to perform is to check the electricity in the wires leading to the blower motor. If all the switches are on, and there is no power going to the blower motor, then the problem lies somewhere else.

Next spot to check would be the relay for the blower motor. Consult the electrical diagrams to determine which one is the correct relay. When the switch is pulled for the blower motor, the relay should make a slight clicking noise on and off. Swapping out relays with one that is known to work is a good method of checking the proper operation of the relay as well.

If the relay checks out, then you want to make sure that the fuse is still good. Identify the proper fuse, and check to make sure that it has not blown. Also, the long tubular fuses that the 911 uses are susceptible to corrosion building up on the terminals. Make sure that the fuses are clean and securely seated. If necessary, check the continuity across the two points that hold and mount the fuse. Photo five in Project 26 shows the location of the fuse box in the front trunk, on the left side.

Many electrical components on the car are also switched through the ignition switch: allowing them to be turned on and off with the ignition. If your blower motor doesn't work along with a host of other equipment, then you might have a faulty electrical ignition switch. One clear symptom of this is the blower motor turning on and off as you jiggle the key back and forth. For ignition switch replacement procedures, see Pelican Technical Article: Replacing your Ignition Switch.

The switch for the device itself may be faulty. In the case of the rear blower motor, the switch is connected to the red handles on the floor of the car. Check the switch with a continuity tester to make sure that it is working properly.

Finally, if all the other tests fail to locate the problem, the wiring may be at fault. Especially on older cars, the wires have a tendency to become brittle, and sometimes break, even if the outer insulation is intact. Using a continuity tester, check each of the wires in the harness that powers the blower motor to see if any have lost continuity.

If all of these steps fail to pinpoint the problem, then you probably made a mistake somewhere along the line, or there might be a short circuit somewhere in the switch or the wiring of the car. Only painstaking testing using a continuity tester will be able to locate such a problem.

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Comments and Suggestions:
vocho53 Comments: its normal that the halogens go off when i put on lights in high beam ?
October 26, 2016
  Followup from the Pelican Staff: YEs. - Nick at Pelican Parts  
cjnepo1 Comments: Hey, ya'll im working on a USA Spec 1971 911E and i'm having some serious problems with the Hazards and Signals. The Hazards do not flash, but I can hear the relay working very slowly, with the lights on the tach NOT working. And the turn signals only work with the Hazards on, but it DOES illuminate the tach lights. I'm using the 1973 and later wiring diagram, but it matches up with a black and white 1972 diagram i was using previously link below. The odd symptoms lead me to believe that the hazard switch isn't grounding on its own, and the turn signal switch isn't getting power on its own, but if I'm honest I have very little grasp of electronic troubleshooting. Cheers, Connor.
October 25, 2016
  Followup from the Pelican Staff: Easy to check. At the turn signal, what is missing when off? Test the wires with the turn signals off. Then activate one side, what is missing? What is added when the hazards are turned on? - Nick at Pelican Parts  
Iggers84 Comments: '84 911 cab, sporadically starts 90% of the time when cold, won't start no crank, when hot. Replaced ignition switch, DME. Battery and starter checked ok. When I turn the key nothing happens, occasionally i keep the key in the start position before it springs back it will crank and start, also noticed the battery light blinks or turns on steady when idling, i don't know if both instances are related. Any ideas you might share will be greatly appreciated
October 9, 2016
  Followup from the Pelican Staff: Assuming you replaced the electrical portion of the ignition switch, you will have to see what is missing when the problem is present. Does the key being turned in each position provide the correct voltage? Since it will start when turning backward I think the voltage from the switch is faulty.
See if this info matches your vehicle.
12V CONSTANT WIRE RED Ignition Harness
STARTER WIRE YELLOW Ignition Harness
IGNITION WIRE BLACK Ignition Harness - Nick at Pelican Parts
 
Mark B. Comments: The headlights on my 1987 Porsche 911 Targa stopped working. Turn and parking lights work but no headlights. Any suggestions on the list for troubleshooting?
September 27, 2016
  Followup from the Pelican Staff: Start by checking the headlights for power and ground. What is missing? - Nick at Pelican Parts  
MarkG Comments: 1984 911 Carrera. Reversing and parking the car one evening, headlights on then smelt burning and it started smoking around the turn indicator stalk area. Quickly turned the headlights off and smoking calmed right down. Any suggestions as to what's up will be much appreciated?
September 16, 2016
  Followup from the Pelican Staff: The switch may be internally shorted. Or overheated from high resistance in the switch. - Nick at Pelican Parts  
zamis964 Comments: 911 964 C4 Year 1991: After around 30-40 minutes driving, when the car is warmed up all the warning lights go on simultaneously "Chrismas Lights." If I switch off the engine the lights go off, but come back after a short time! Any ideas? My mechanic seems to be overwhelmed! Many thanks! SL
September 14, 2016
  Followup from the Pelican Staff: Possible the ignition feed or a ground is being lost. Look at the wiring and find the circuit that is related to them all. - Nick at Pelican Parts  
drew Comments: Hey, i have a 79 930 i just acquired. when i turn the headlights on, the speedometer and oil gauge turn off. thanks!
September 13, 2016
  Followup from the Pelican Staff: Check the gauge ground. - Nick at Pelican Parts  
Okla912E Comments: 1976 Porsche 912E #0893: Ground strap and battery replaced; fuse block is hot. However, absolutely no power to ignition switch or anywhere else within the cockpit. Note: Engine and transmission are both out of the car. Any ideas on where to start and how to proceed? Thanks for any help.
August 28, 2016
  Followup from the Pelican Staff: Check if the main battery cable has a union at the starter that is detached. - Nick at Pelican Parts  
Msteel Comments: 1980 911. Very clean low mile car. I noticed my odometer stopped working. I removed it and checked the gears. Everything looked fine. I reinstalled and it started working again. I soon as I turn on the head lights it stops. When headlights are turned off it starts working again. Bad ground ?
August 20, 2016
  Followup from the Pelican Staff: Sounds more like a power issue. I would check power and ground to the speedo with the lights on and off, see what is different. - Nick at Pelican Parts  
Eddy Comments: Have a 78 911, no power anywhere and the ground is reading 10 volts.
August 14, 2016
  Followup from the Pelican Staff: SOunds like your ground is bad. - Nick at Pelican Parts  
chris Comments: Hi, I have a 79 SC, with an electrical problem, the brake warning light and the red ignition light?, stay on all the time, when I brake or turn the indicators, or put it in reverse the Rev counter jumps. I've checked fuses and as many earths as I can find but nothing changes. Any ideas?
August 13, 2016
  Followup from the Pelican Staff: What is charging system voltage and current? - Nick at Pelican Parts  
jon48116 Comments: I have a 1988 911 Carrera coupe. The left side front/rear parking lights stopped working. Blown fuse. Replaced the fuse and it immediately blew again when lights were switched on.
Would appreciate advice on where to start looking for this apparent short. Thanks.
July 27, 2016
  Followup from the Pelican Staff: I wouldn't bother looking for the short. it is easier and faster to run new wires to the lights. Grab a wiring diagram to confirm the circuit isn't shared, then run new wires to the lights. - Nick at Pelican Parts  
Kurt Comments: Nick,
I found the power to the whole system, as well as the blower switch, comes from the relay red/white in the smuggler's box. I had both power sources black and red wires but nothing coming out on the r/w wire. Replaced the relay and all is well.
July 24, 2016
  Followup from the Pelican Staff: Thanks for the follow up. We appreciate it.
- Nick at Pelican Parts
 
aweb109 Comments: hello everyone i own a 87 911 m491 with the original radio it only plays out of one side i changed the speakers and cross checked them both work. but only plays on side .. any ideas
July 12, 2016
  Followup from the Pelican Staff: The radio channel may be faulty. Have you tried swapping the speaker channels at the rear of the radio? - Nick at Pelican Parts  
Kurt Comments: What a wonderful service. Perhaps you can help me with an 85 Carrera whose A/C has lost ALL power, no blower, no condenser fan power, no compressor clutch 'clicking', etc. My question is; are there two keyed B+ terminal 15's on this ignition switch? It seems that the fuses & relays are both getting 12+V but the + terminal on the blower motor switch has no voltage. If I provide B+ to this terminal, the system works fine. Does the 12V terminal on the blower switch get it's voltage from a second #15 terminal on the ignition switch?
Thanks for your help.
July 12, 2016
  Followup from the Pelican Staff: I don't have the wiring to confirm., but the issue may be in the fuse panel. I would get a wiring diagram, if you can share it with me I can further advise. - Nick at Pelican Parts  
david Comments: Wayne, I am the original owner of a 1987 911. Recently noticed the front left running lights frt and side were not lighting. Turn signals work fine. Checked fuse #12 and reseated relays, without success. Disassembled unit and find that the power leads gray/red and black/white are in common. Double checked by disassembling right side unit and get 12v across these leads which explains why that side works, duh. Traced leads into trunk, and do not see any obvious connectors that may be the culprit. Your troubleshooting advice would be appreciated.
Thanks, David
June 29, 2016
  Followup from the Pelican Staff: If the circuit has power and ground on one side and not the other, the issue is in the wiring. You can either inspect the entire wiring harness, or run new wires. - Nick at Pelican Parts  
dvmartel Comments: 2011 Boxster Spyder lights will not turn off. Only drivers side affected. The following set of lights are always on: front white LED bar, side marker and rear running lights stay on, only disconnecting battery turns them off.
June 5, 2016
  Followup from the Pelican Staff: Sounds like the headlamp control module has an issue. I would check for fault codes and run a function test using Porsche scan tool. - Nick at Pelican Parts  
Beano Comments: Yes I have 1974 911, Was out for a drive and stopped to pick something up from the store and when I tried to start the car I couldn't get it to turn over. I had it towed to my house. I replaced the 13 year old battery and it fired right up. But now my truck light don't work my braked light keeps blinking and my warning sound when the key in is the ignition dose not work either. I checked all of fuses and they are ok. what could be the problem?
June 5, 2016
  Followup from the Pelican Staff: Could be a faulty ignition switch or a bad ground. - Nick at Pelican Parts  
larsniklas Comments: I have a 1987 911 Porsche Carrera. The light goes up and down also the blower motor goes faster and slower. Vould it be the voltage regulator, the alternator or a grounding problem? or something else.
May 30, 2016
  Followup from the Pelican Staff: I would assume a charging system issue. Check charging system voltage and current when the problem is present. - Nick at Pelican Parts  
Mike Comments: Hey Nick question about seat belt relay it's a porsche 1987 911 targa
May 27, 2016
  Followup from the Pelican Staff: If you look in the front trunk area, it is a square black relay about two inches high mounted in a relay panel. - Nick at Pelican Parts  
mike Comments: hey Nick do you know where the seatbelt relay is can't seem to locate it
thx mike
May 20, 2016
  Followup from the Pelican Staff: What vehicle are you working on? - Nick at Pelican Parts  
Walt Comments: I have a 83 911 SC with a alternator problem. When the car is started it immediately starts to smoke around the alternator and the it smells like an electrical burn smell. I disconnected the battery and removed the alternator belt and the alternator moves freely without any resistance or noise. Once I connect the battery the alternator locks up and will not spin. When started without the belt it again immediately starts to smoke and smell of electrical burn. Any help would be appreciated.
May 7, 2016
  Followup from the Pelican Staff: The alternator may be shorted internally. Grab a wiring diagram and confirm the harness is OK and has no shorts, if not, replace the alternator. - Nick at Pelican Parts  
Bucephilus Comments: Update to my wipers, instruments, headlights...sort of everything going whacky electrical issue. After checking plugs and connectors all over, I returned to the battery, cleaned it again only this time out of frustration I decided to clean the ground strap's connection to the body. To my surprise, another terminal on that stud was broken and out of sight until I put my hand on it. For less than $1 I installed a new terminal and I'm back in business. Lesson learned: whenever the electrical system behaves goofy, check your ground connections. Thank you Nick for nudging me under the dash panel some Ibuprofen and my back will be fine.
May 1, 2016
  Followup from the Pelican Staff: Glad you found it aND glad to help! - Nick at Pelican Parts  
MIKE Comments: HI I HAVE 1986 911 WHILE DRIVING THE FASTEN SEAT BELT LIGHT COMES ON AND THE THE RADIO BLANKS OUT...ALSO MY FUEL GAUGE IS STUCK ON FULL...THX MIKE
April 27, 2016
  Followup from the Pelican Staff: Pick one of the items to focus on, then you may find the cause to all the issue. For the radio, is it losing power or ground? - Nick at Pelican Parts  
Cypress911 Comments: 86 911/930 Cabriolet - no power at the turn signal/hazard relay. If I run bypass power to relay turns work fine. However the hazards only work when the turn stalk is put into either the left or right turn position. Have replaced turn stalk w new part. All wired correctly according to Benteley manual. Any ideas?
April 24, 2016
  Followup from the Pelican Staff: I don't have the wiring to review, can you share it? It may be missing the ground to the flasher. - Nick at Pelican Parts  
mojack Comments: having problems with right side front running light and rear brake light all on the right side...!983 911 Turbo
April 17, 2016
  Followup from the Pelican Staff: What is the issue? Is power or ground missing? - Nick at Pelican Parts  
plumbo1 Comments: Hi Nick, I'm restoring a 924 the problem I've got is the headlights won't turn off, the only way is to disconnect the battery, any help would be great
April 4, 2016
  Followup from the Pelican Staff: Check if the switch signal is shorted. Unplug the headlight switch, while monitoring voltage. Does it change when unplugged? - Nick at Pelican Parts  
SGF Comments: Hi Nick,The normal circuits:seats/int.lights,warning lights are on. The rest of the circuits are normaloffuntil a door is opened, then the mirrors,windows and brake light circuits come on and stay on. Disconnecting/reconnecting batt.makes all normal again, until a door is opened or ign.is turned on/off.then those circuits come on and stay on.
March 12, 2016
  Followup from the Pelican Staff: Thanks for the info. My advice is to ge ta wiring diagram, check what fuses are powered by terminal 30 and what fuses are powered by terminal 15. My guess is one terminal 15 component is stuck on, powering a group of items. - Nick at Pelican Parts  
SGF Comments: 86 Carrera, disconnect/reconnect batt. all normal,When ign. switch turned on/off fuse box stays energized. Disconnect/reconnect batt. all normal. Open/ close door fuse box energizes, stays energized after closing door.Where should I look to solve this problem? Thanks.
March 10, 2016
  Followup from the Pelican Staff: What is the issue in the fuse box, some of it may have constant power. What component is staying on? - Nick at Pelican Parts  
Wola65 Comments: 911 sc targa: the interior light doesn't work properly. When the door is opened, the light doesn't work as well at the drivers side as the passenger side. The bulb is okay, it works when I change the position of the light. What can be the problem?
March 1, 2016
  Followup from the Pelican Staff: The ground for the passenger switch may be faulty. - Nick at Pelican Parts  
Kaz Comments: Hi Community,

I have a 1977 Euro 911 SC, turn the key and I have no current. Nothing.
No altinator light, no fuel pump, nothing. Fuses are fine.
It has happened before, after it rained heavily and there was a lot of condensation under the hood. Waited a couple of days then it started. Should I start with the ignition switch? Or is there a current issue? Is there a relay could be faulty?
February 22, 2016
  Followup from the Pelican Staff: Start by checking if the ignition switch has power and ground to it, if so, check if it switches as it should to power when the vehicle. - Nick at Pelican Parts  
wheelspin Comments: Okay this is a fun one. 1976 912E , while driving at freeway speeds not around town for more than 7 minutes engine fully warm there is a loud buzzer that sounds like its in the steering column that starts to go off. it gets progressively louder. when you hit the brakes the buzzer goes away, when you slow down to less than 35mph the buzzer goes away. Its like the buzzer is connected to the brake switch.
any ideas?
January 24, 2016
  Followup from the Pelican Staff: I think that would be the key buzzer. Noise should only occur when the door is open with the key installed. Check if the ground for the door switch is faulty. - Nick at Pelican Parts  
Iatoluso Comments: I just bought a 2001 Carrera cabriolet. Nice unit! The rear right turn signal does not work rapid indicator on the dashl I replaced the bulb - same problem. Am I looking at a relay problem?
December 29, 2015
  Followup from the Pelican Staff: First check that the bulbs on the left side are all working. The match them up to the bulbs on the right. once you identify the faulty light. Check power and ground to the bulb when the problem is present. - Nick at Pelican Parts  
chas Comments: My 85 911 Oil press/temp gauge pegs hot and no pressure when I turn on the headlights. I have looked at the elec diagrams from the manual, but still can't isolate
December 25, 2015
  Followup from the Pelican Staff: Run a new wire for the pressure signal to the engine. If fixed, the lighting and pressure line are shorted. - Nick at Pelican Parts  
misterc01 Comments: Hazard/flasher issue. 1986 944. Key off: Hazards flash and dash indicator flashes. Left/right front turn signal lights come on, stay on when selected parking mode and dash indicator stays on, buzzer sounds. Key on: No hazard, no turn signals, dash indicator stay on. Was fine, hallway to church, they signals quit. uses check good and swapper flasher relay to no avail. .
November 16, 2015
  Followup from the Pelican Staff: Does the flasher have the same voltage supply key on and off? - Nick at Pelican Parts  
Jon Comments: Hi I'm having trouble on the 1981 porche 911 coupe customer brought it in with a no start but someone was in it first found these four wire disconnected i can't seem to find a home for the black connector but i turn the key with all the white connectors disconnected the fuel pump runs and i have no spark if i connect the two white connectors furthest to my left the fuel pump doesn't run and i have spark... do you guys have any idea what it could be wire crossed etc... ok just found out i cant upload the picture for some reason so the connectors are to the left of the engine bay the black one is a three plug female connector with a blue brown and black wire the two white connectors a two plug female connector one has a red and brown with a red stripe wire and the other has a yellow with gray stripe and two brown wires and theres a third white connector thats a male with brown with red stripe and two red wires
November 5, 2015
  Followup from the Pelican Staff: Hard to say what is not plugged in correctly. I would grab a wiring diagram and check the wiring colors and connector terminal counts. Too much room for error guessing at it, - Nick at Pelican Parts  
lone ranger Comments: Hello, 1969 911E. Lights will not turn on at all. Dipper will flash the high beams, but no other lights working. If I turn the turn inicator on in either direction, with the headlight switch on, then the lights work. This was an intermittent issue, where the headlights were working and would go off and stay off when the highbeams were activated. All fuses seam fine. I am pretty good with electrical issues, but this has me stumped.
November 3, 2015
  Followup from the Pelican Staff: I would assume an issue with the headlight relay. Have you confirmed it has power and receives signal from the switch?

Check the wiring here:
http://forums.pelicanparts.com/porsche-911-technical-forum/476950-headlight-relay-wiring-early-911-a.html - Nick at Pelican Parts
 
nevadachuck Comments: Ooops. My bad. Brain cramp.
TS are out.
RF low beam is off and on and I expect it is an unrelated issue since it has popped up before.
Hi beams and 4 way are ok.
Fuses good contacts cleaned.
Considering hot wire to TS power input to see if switch works but wondering possibility of frying TS combo switch.
October 29, 2015
  Followup from the Pelican Staff: Check if the switch sends power or ground to the relay, then used a fused jumper to supply that signal to the circuit and see if problem is remedied. - Nick at Pelican Parts  
nevadachuck Comments: 2 Questions:'75 911s Anniversary Coupe
1 Have a 26.7 mADC leakage. That seems negligible. Not going to track it.
2 Hi/Lo Turn Sig stalk issue: Replaced flasher relay with turn sig not working. Hazards OK. New relay did not cure. Related only Hi-Beam works. On Lo-Beam only drive side works halo lighting works. Fuses OK.
October 21, 2015
  Followup from the Pelican Staff: 1. anything below 50, I wouldn't sweat.

2. What are you trying to fix? Turn signals or high beams? I don't follow. - Nick at Pelican Parts
 
misterc01 Comments: Regarding the switch on the power window housing that somehow controls the blower, I am not sure where to look - WHY would there be circuit to the blower motor going through the power window switch circuitry? Is it possible that thee is a relay connection in common? Is there a reasonably easy to read schematic somewhere? Thanks Nick
October 14, 2015
  Followup from the Pelican Staff: I don't know why someone wired it that way. Like I mentioned earlier, they may have been trying to repair an electrical issue. The repair may be back-feeding voltage into a circuit, causing a short. If you don;t know where to look, start by grabbing a wiring diagram, or asking a Porsche repair shop for help. - Nick at Pelican Parts  
misterc01 Comments: Regarding the switch on the power window housing that somehow controls the blower, I am not sure where to look - WHY would there be circuit to the blower motor going through the power window switch circuitry? Is it possible that thee is a relay connection in common? Is there a reasonably easy to read schematic somewhere? Thanks Nick
October 14, 2015
  Followup from the Pelican Staff: I don't know why someone wired it that way. Like I mentioned earlier, they may have been trying to repair an electrical issue. The repair may be back-feeding voltage into a circuit, causing a short. If you don;t know where to look, start by grabbing a wiring diagram, or asking a Porsche repair shop for help. - Nick at Pelican Parts  
misterc01 Comments: So a previous owner put in an on off switch in the drivers power window control panel. Turns out in the on position, with the car off, the blower motor runs. When it is off, the blower is off, and when the car starts, the blower works with the blower speed selector. When I pressed the wiring, then the b lower cycled on and off and the passenger window did not always work. So what is the sneak circuit here and how can I eliminate the stupid switch on the power window panel?
October 12, 2015
  Followup from the Pelican Staff: OOF. hard to say. What i would do is remove the switch and check what circuit(s) it is feeding. I would assume the owner was trying to fix an electrical issue. You will need to repair whatever the switch was trying to do. - Nick at Pelican Parts  
D-man Comments: Gentlemen.

I have a 1983 911 SC and last night I had an electrical fire start behind the turn signal arm in the steering column. Obvious a short somewhere,is this a problem with these cars, best way to fix? Pretty exciting to say the least. Thanks for your help/thoughts.

Darrell Holland
October 3, 2015
  Followup from the Pelican Staff: Best bet is to remove the wheel and switch, inspect what is shorted. Once you identify the circuit, check the current draw on the circuit to be sure it won;t short again. - Nick at Pelican Parts  
Soup Comments: 1987 911 carrera - my electric seats are blowing the fuse when I try and make an adjustment to the seat. Can you guide me where to start looking for the problem.

Thanks in advance.
September 21, 2015
  Followup from the Pelican Staff: Inspect the wiring harness in the seat. It may be shorting when you move the seat. if it is OK, check the motor for the direction you are attempting to move. - Nick at Pelican Parts  
bernabeu Comments: sorry, didn´t realize this is not the right place to post my below comment about my GTS. I´ll ask this question on the relevant forum.
September 5, 2015
  Followup from the Pelican Staff: Thanks. - Nick at Pelican Parts  
bernabeu Comments: 2016 991 GTS 2 PDK. There is a continuous low beeping sound between 2 km/h and around 8 km/h. The sound is heard not just at startup but anytime the car is in that speed range both forward and reverse. Beyond that the sound seems to go away. I took it into the dealer who did a full systems check and reported that everything is absolutely fine with the car. They did acknowledge hearing the beeping sound and are going to check other 991 GTSs to see if they can figure out what it is. Could you tell me what it could be? Fyi, I´ve had the car for just over a month and I started noticing this beeping sound a couple weeks back.
September 5, 2015
  Followup from the Pelican Staff: Haven't seen these cars yet, so I can't be much help.

I opened a post in our forums. A Pelican community member may be able to answer your question.
- Nick at Pelican Parts
 
Kamps Comments: Hey Nick. Never mind. Figured it out - there is another fuse coming the ignition switch that was blown.
August 30, 2015
  Followup from the Pelican Staff: Thanks for the follow up. We appreciate it.
- Nick at Pelican Parts
 
Kamps Comments: How would that effect the dash, tail and side lights?
August 28, 2015
  Followup from the Pelican Staff: There could be a short when the switch is pulled. - Nick at Pelican Parts  
Kamps Comments: not at this point
August 28, 2015
  Followup from the Pelican Staff: Then the issue may be the flash switch. - Nick at Pelican Parts  
Kamps Comments: At this point - I have the ability to activate the high beams for normal driving push fwd on the TS stalkjust no flashing capability coupled with all the other lights that are put
August 28, 2015
  Followup from the Pelican Staff: is there power out of the stalk, (for flash to pass)? - Nick at Pelican Parts  
Kamps Comments: Reply to Nick From Kamps.
Unfortunately no - I thought the addition of the lights back into the system might have caused a fuse to blow and just disconnecting them again and replacing the fuse would do the trick - but that didn't happen. That's why I'm seeking professional help.
August 28, 2015
  Followup from the Pelican Staff: Go to the switch, monitor the headlight output, then operate the flash high beam feature, does power go to the lights through the switch? - Nick at Pelican Parts  
Kamps Comments: Hey Nick. I've got an interesting electrical issue for you - I've got a '75 911 and i've got an with the driving lights - they've not ben connected and when i did connect them - i lost dash, driving and sidelights as well as the ability to flash my high beams when i se another Porsche. I've checked all the fuses and all seem to be good. Headlights, turn signals,brake lights and reverse lights all work fine. Is there another fuse location i might be missing? Hope you can help. Thanks
August 27, 2015
  Followup from the Pelican Staff: If the driving lights are disconnected, does function return? - Nick at Pelican Parts  
drew Comments: I have a 1986 911 turbo, crank won't start. I think the dme switch is bad. looking for the location of the switch. Can you help
August 24, 2015
  Followup from the Pelican Staff: DME switch?

I can't help without knowing what is missing from the system when you are trying to start it. When your engine doesn’t start you’ll want to check the basics. Check spark, fuel injector pulse and fuel pressure, volume, quality and engine compression. Are there any fault codes? Once you figure out what is missing, it will be easier to diagnose.
- Nick at Pelican Parts
 
Hedgehog Comments: 1999 911 Carrera 996 brake lights not working. Bulbs seem fine - tail lights work, but not brake. Was moisture in lenses but have dried out. Contacts in bulb seat look dusty & a little corroded but scratching clean hasn't solved problem. Help !
August 20, 2015
  Followup from the Pelican Staff: When you hit the brakes, is there power at the bulb sockets? Does the high mount brake light come on? If not, check switched power of the brake light switch.- Nick at Pelican Parts  
Bucephilus Comments: 1976 911S all original suddenly with key on the wipers are triggered 3 times whenever I use either the turn signals or attempt to turn on the headlights, which also suddenly do not work. Another strange behavior is while the wipers are running and I turn off the key to the accessory position, I hear a strained noise and noticed the gauge needles moving erratically. Any thoughts?
August 16, 2015
  Followup from the Pelican Staff: I would monitor the wiper switch when the problem is present. It may be a short in that switch. - Nick at Pelican Parts  
JR88 Comments: 88 Porsche Targa 3.2 Rear and front flashers work fine outside and on dash. Parking lights work fine with switch arm in on position when car is turned off. neither front or rear turn indicators work with car running on dash or on car. Battery warning light on dash comes on after about a minute when car is running. Have checked bulbs and fuses. Any ideas? All started after I found a loose wire in the right front turn indicator harness and accidently blew fuse rewiring it didn't know turn switch arm was on with car off and sparks occurred at work site and also blew fuse at that time. Changed the bulbs and fuses and from that time can't get turn lights to work? Any ideas
August 6, 2015
  Followup from the Pelican Staff: Can you monitor signal from turn switch, does it change when you activate it? I wonder the switch was fried when the short occurred. - Nick at Pelican Parts  
coonhunter Comments: 1980 Porsche 928 no voltage at fuel pump fuses good with power
August 3, 2015
  Followup from the Pelican Staff: I don't have wiring for the vehicle. Have you checked the rear of the fuse holder? Check if there is power, if none, trace the wiring to the junction or relay that powers it. - Nick at Pelican Parts  
JMac867 Comments: 1976 911s... replaced the Perma Tune ignition unit... reinstalled the battery... turned it over... started to fire but didn't quite...shut off the ignition... fuel pump stayed on... interior lights stayed on... took the key out and everything stayed on. The fuel pump was pumping fuel all over the engine. I had to disconnect the battery again to stop power. Ignition switch??? The Perma Tune unit wouldn't cause any of this would it??
Thank you
July 26, 2015
  Followup from the Pelican Staff: Check if you have constant power back-feeding the ignition switch. Could be related to the new ignition unit. - Nick at Pelican Parts  
Levi Comments: Hi!!I GOT A PORSCHE 911 TURBO 1987 AND START UP AND SHUTS OFF, SOME BODY CAN HELP ME ? THANK YOU!!!
July 23, 2015
  Followup from the Pelican Staff: I can't help without knowing what is missing from the system when you are trying to start it. When your engine doesn’t start you’ll want to check the basics. Check spark, fuel injector pulse and fuel pressure, volume, quality and engine compression. Are there any fault codes? Once you figure out what is missing, it will be easier to diagnose.
- Nick at Pelican Parts
 
audrey Comments: 1983 911 coupe headlights only work on high beam ,if battery not disconnected its dead
June 23, 2015
  Followup from the Pelican Staff: Check dimmer switch function. With the headlights on, does power switch between the headlights and high beams? - Nick at Pelican Parts  
Dallas Comments: 1979 911 w/ 3.2L: When I try to turn on the headlights, the window wipers come on instead. The fuses are all good, and I think both bulbs are good too, as the driver side bulb came on very dim, intermittently. Where should I start?
June 18, 2015
  Followup from the Pelican Staff: It sounds like the grounds may be bad for the headlights, and they're trying to ground through the wipers. Trace the wiring back from the headlights and I bet you'll find your answer. - Casey at Pelican Parts  
Marken Comments: I have a 1970 911T. Rarely do I drive it in the rain. Had to yesterday. This morning the neither turn signals work. Don't think it's a fuse since both are not working. Any ideas? Thanks!
June 16, 2015
  Followup from the Pelican Staff: Could be a faulty hazard switch, or turn signal switch. First remove the lenses and see if there was any water intrusion where it shouldn't be, then check under the dash for any areas of water intrusion. Chances are something got wet that wasn't supposed to. A good visual and then a thorough drying out of whatever you find will likely solve your issue. Is your windshield seal cracked? The seals around the turn signal lenses or taillight lenses cracked? Does the turn signal switch feel like it should? Do the hazard flasher lights work? Do the indicators in the tach light up when you activate the turn signal switch? - Casey at Pelican Parts  
tom Comments: My seat belt warning sound won't shut off when belt is on in my 1979 SC?
June 12, 2015
  Followup from the Pelican Staff: Check the wire to the belt buckle. It may be faulty. If not, the buckle itself may be. - Nick at Pelican Parts  
RedDragon87P944 Comments: 1987 Porsche 944 Base. Factory alarm is constantly pulling 11-15 volts clearly draining my battery, I have tried disconnecting, turning the alarm key on/off, and bypassing and still cannot shut off the voltage. The warning buzzer relay is missing but the alarm can still go off? Help!
May 27, 2015
  Followup from the Pelican Staff: Do you mean 11-15 amps?? I don't think an alarm could pull that many amps. How are you testing the draw? Are you sure there is not another aftermarket alarm installed? - Casey at Pelican Parts  
kim Comments: I have a 1988 911 and am experiencing headlamp problems. When I turn the lights on sometimes only one side comes on, when I use the high beam switch on the TS it will turn one side off and when I dim the switch it changes sides on which headlamp works. Then when I turn the fog lamps on things kind of switch around and only one fog lamp works. After reading comments here it sounds like I might have a bad HL switch or TS switch. HELP! thanks
May 21, 2015
  Followup from the Pelican Staff: Those are possibilities, just make sure that all your ground points down by the battery negative cable are in tact, and that the grounds are OK at the fuse box carrier plate. I have attached a picture pointing to the major ground points in the car. I'd be most concerned with 1-3, but eventually inspect them all because many strange and intermittent issues can be solved by cleaning the grounds. - Casey at Pelican Parts
GordP Comments: I want to bypass the factory alarm on my 1982 911SC. The wiring from the key switch on the driver's door has a momentary open which causes the alarm to beep when opening or closing the door. Could you confirm that connecting pins 61 to 61 and 87a to 15 on the alarm module connector is the correct procedure? Instead of this , could I simply disconnect the alarm horn from the Hn terminal on the alarm module. Thanks
May 19, 2015
  Followup from the Pelican Staff: I don't have the wiring for that vehicle.


I opened a post in our forums. A Pelican community member may be able to answer your question.

I would grab a repair manual. It will have the procedure, special tools and torque specs.

Give our parts specialists a call at 1-888-280-7799. - Nick at Pelican Parts
 
nick1403 Comments: 87 944 N/A-A click under glovebox every 10 sec or so, with slight drop in RPM. Almost sounds like A/C compressor is kicking on and off, but I don't have the A/C switch on! Any ideas?
May 14, 2015
  Followup from the Pelican Staff: See if it corresponds with the cooling fan in the engine compartment. If it is cycling that quickly the low speed fan resistors are probably faulty. - Casey at Pelican Parts  
Scott Comments: 89 911 Targa: high beams automatically come on when headlights are on? High beams can be disengaged when stalk is pushed forward and back but continues to happen over and over again? Is this a switch issue? What part is required to remedy?
April 18, 2015
  Followup from the Pelican Staff: Does your high beam/turn signal switch feel nice and tight when you push it forward, and pull it back? Did this failure happen after some other work was done to the car?? Does the "flash to pass" function work on your car? - Casey at Pelican Parts  
CraigeO Comments: I have a '87 Carrera. I am have an issue when ever I hit the brakes the radio turns off. Same happens if I turn on the light, use a turn signal or try to use the power seats. The battery is from 3/12 and I leave it on a battery tender. I drove the car 45 miles tonight, got home and when I turned it off, it wouldn't restart. Could all of this be caused by a faulty battery of could the alternator not be recharging. I didn't notice the battery light coming on but, I would assume that if the battery is dead that quick either the battery is bad or the alternator isn't recharging. Thanks for any and all input.
April 14, 2015
  Followup from the Pelican Staff: You will need to check the charging voltage at the battery with a volt meter. With headlights, and defroster on at 2000 RPM you should not see above 15V or below 13V. Judging by the symptoms you will find the voltage inadequate. Be patient on this as sometimes the alternator will charge OK for a few minutes then drop off. You may want to buy a volt meter to keep plugged in to the cigarette lighter if it is an intermittent problem, you can monitor the voltage easily while driving. - Casey at Pelican Parts  
Reg10854 Comments: Problem NO RH headlight & parker ???
checked bulb & fuse , all appear to be intact/work
NO power ! any advice ?

April 5, 2015
  Followup from the Pelican Staff: What is the year and model of the vehicle?
- Nick at Pelican Parts
 
sherman229 Comments: I have a 1975 911s it's has been sitting in my parents garage for the last 25 years or so, all of the fuses are blown, now I noticed there are different color fuses and I got all the replacements exept the pink, and my local parts store does not have the pink in the order books. Can I replace the pink ones with another type? Or are the pink fuses just faded red fuses?
April 3, 2015
  Followup from the Pelican Staff: Likely faded red. There should be three red fuses. - Nick at Pelican Parts  
DAve Comments: Nick, i have a 1987 911 Carrera,had brake and rear running lt problems. replaced the brake switch 1 have ordered the second one. Now i have no rear turn signals or running lts. Any suggestions Thanks in advance
March 29, 2015
  Followup from the Pelican Staff: Does your turn signal switch stalk feel pretty solid? Also check to make sure that the fuses are in tact and not corroded. When checking the fuses also make sure that the wires coming out of the bottom and top of the fuse blocks are tightly held in place by the screws at the top and bottom of the fuse block. - Casey at Pelican Parts  
928Guy Comments: My 1983 Porsche 928 left front headlight, left front parking light, left front turn signal and left front side marker light all went out. Only the left front fog light works. All other exterior lights work. Fuses are ok.From looking at the electrical diagrams these lights appear to be on separate circuits. It seems unlikely that all left front lights, except the fog light, would go out at the same time? Is there a single point of failure for all left front lights except the fog light?
March 14, 2015
  Followup from the Pelican Staff: Check if the fuse block has corrosion or damage, and check the bulkhead connector. Those are the only two places I can see in common. - Nick at Pelican Parts  
Iandb Comments: Hello,
My 1984 944 has started to sound the lights-on warning buzzer without opening the driver's door & stays on while the car is being driven. It happened after driving in heavy rain. I'm just thinking it's a damp relay, but if it persists is it possible to disconnect the buzzer until it's repaired? Your advice please.
February 26, 2015
  Followup from the Pelican Staff: Check to make sure that your front fuse box is dry. Sometimes the cowl area will fill up with water. I am not 100% sure which buzzer is responsible for the "lights on" from looking at the diagrams. - Casey at Pelican Parts  
Docsuds Comments: Thanks for your input!You were right as now my Bose music system has crashed all together and has a display 'Amplifier failure'! If this can be a DIY-do help! Battery voltage has not dropped less than 13..
February 11, 2015
  Followup from the Pelican Staff: If you have an amplifier problem, you will need to confirm it is powering up and communicates. Testing can be performed using a Porsche scan tool. Or swapping in a known good unit. - Nick at Pelican Parts  
docsuds Comments: I have a PCM head Unit. Could it be the voltage regulator?
Thanks for your prompt reply.
re 2002-911, convertible 996. My music system auto cuts and comes on active again, drained my battery once! Very annoyed with interrupted music playing. Any suggestion where I should be looking at to resolve this issue please!
February 5, 2015
  Followup from the Pelican Staff: The PCM system uses a fiber optic network to link the various components in the audio system. Most commonly a fiber optic network (MOST Bus) breakage will cause this issue. Most often in my experiences the amplifier (if BOSE system), or the CD changer will cause this issue.

Here is a link to a good article written by my friends Tony Callas, and Tom Prine.

http://www.callasrennsport.com /pcm-issues/

It's a long shot if the voltage regulator. As Tony says in the article, the control units need to be scanned and then if there are OVER, or UNDER voltage faults present then think voltage regulator. While driving your car you can monitor the alternator voltage via the voltage gauge in the instrument cluster. You should see the normal voltage range from above the 12 volt mark to slightly above the 14 volt mark. I'm guessing you've probably got MOST bus communication errors, which would need to be diagnosed. Your issue may end up being two separate issues.
Let me know how that voltage gauge looks during a 30 minute drive using the A/C and headlights. - Casey at Pelican Parts

 
Balloonmeister Comments: The bulbs in the tach are brand new LED bulbs and they both work fine. This problem was also present BEFORE I replaced the tach bulbs. As stated previously, the turn signals on the four corners of the car all work properly, that is, there is no switching from the left turn signal to the right turn signal on the outside corners. This problem is only seen on the two turn indicators on the tach.
February 4, 2015
  Followup from the Pelican Staff: Have you tried new non LED bulbs?

Check to see if you might have something wired incorrectly.

Pay close attention to the multi connector #85 for corrosion or possible damage, or partial short

http://www.pelicanparts.com/911/911_Parts/Electrical/911_electrical_1973_CIS_legend1.jpg

http://www.pelicanparts.com/911/911_Parts/Electrical/911_electrical_1973_CIS_Part1.jpg

- Casey at Pelican Parts
 
Balloonmeister Comments: 1972 911T with 3.2L motor now installed. When I turn on the left turn signal, the left green arrow in the tach flashes brightly several times and then switches to the right arrow in the tach and flashes dimly. Sometimes it may switch back to the left arrow, sometimes not. The turn signal lights on the outside of the car all work properly all of the time. Where do I start?
February 4, 2015
  Followup from the Pelican Staff: First off...NICE CAR!!! First thing I would check is to make sure the bulbs are all quality bulbs of the proper wattage and voltage. INCLUDING the ones for the turn signal indicators in the tach. One question I have is: When the indicator in the tach switches to the right, do the exterior turn signals follow suit?? -  
docsuds Comments: re 2002-911, convertible 996. My music system auto cuts and comes on active again, drained by battery once! Very annoyed with interrupted music playing. Any suggestion where I should be looking at to resolve this issue please!
February 2, 2015
  Followup from the Pelican Staff: Is your car equipped with the PCM OR CDR head unit? -  
TJ Comments: Apologies Nick, - Re my inquiry on 8th Jan TJ about the heater going to MAX whatever setting you select with the dial between the seats. It does look like new heater butterflies and hoses have been fitted by the heat exchangers- It's a 1988 3.2 Carrera
January 12, 2015
  Followup from the Pelican Staff: The output temp or blower speed? The resistor may be faulty if it is blower speed. - Nick at Pelican Parts  
TJ Comments: The auto heating lever always goes to max up when you turn the dial between the seats even to low settings. can you advise what would cause this please. Thanks
January 8, 2015
  Followup from the Pelican Staff: What vehicle are you working on? - Nick at Pelican Parts  
TJ Comments: The main beam on my 1988 Carrera only works when you push the stalk forward, when you pull back nothing happens - Would this be the switch contacts or relay!
January 4, 2015
  Followup from the Pelican Staff: Hard to say, I would check the switch output to start. If it is sending voltage to the next component, test from there to the lights. - Nick at Pelican Parts  
george Comments:
December 12, 2014
David Comments: Response to Nick. Yes, they appear to. Again nothing is happening on the outside, just the inside. All lights appear to operate correctly on the exterior. We did change the relay and that didn't do anything.
December 12, 2014
  Followup from the Pelican Staff: I recall an issue like this. I would check the ground for the instrument cluster or turn signals. Sometimes a loose ground may cause back-feeding. - Nick at Pelican Parts  
David Comments: The interior hazard lights on my 75 911S continue to flash when driving even though the hazard lights are not turned on. They are not flashing on the outside. When they are turned on they work correctly on the outside. All other lights operate correctly. Any idea on why interior hazards continue to flash
December 10, 2014
  Followup from the Pelican Staff: Do the lights flash in the same frequency as they do with the hazard lights on? - Nick at Pelican Parts  
RDPBMP Comments: They all failed at once. I worked on grounding and got the headlights low beam and signal lights back. Still no high beam nor fog lamps. Thanks for your comments. Any suggestions for the high beams and fog lamps?
December 4, 2014
  Followup from the Pelican Staff: COuld be the same issue. Maybe they have separate grounds. Check if the bulbs have power and ground. Trace the circuit for which one is missing. - Nick at Pelican Parts  
RDPBMP Comments: 1976 911, headlights, fog lamps nor turn signals work. 4-way flasher works okay. Park lights work okay. Where do I start?
December 3, 2014
  Followup from the Pelican Staff: See if there is a diagram here:

http://www.pelicanparts.com/911/911_Parts/911_electrical_diagrams.htm

You may have a faulty fuse or bad ground. Did the lights just fail together, or were they failing one at a time? - Nick at Pelican Parts
 
Jimmty Comments: my mirror toggle switch wires got unplugged on my 1978 SC where can I find what wires of six go into what hole switch
November 25, 2014
  Followup from the Pelican Staff: Good question.

I opened a post in our forums. A Pelican community member may be able to answer your question.
- Nick at Pelican Parts
 
wifestoy Comments: Picture included.
November 5, 2014
  Followup from the Pelican Staff: Ok, got it. - Nick at Pelican Parts  
wifestoy Comments: here is a picture of the switch. that's just above the ignition key.
it's a rocker switch just like the one for the headlight washer.
it had three wires going to it one light green one light blue and one black.
November 5, 2014
  Followup from the Pelican Staff: That is the mirror switch, should not cause any engine issues.

Check the DME relay, see if it is faulty.- Nick at Pelican Parts
 
wifestoy Comments: 1984 911 Targa: I have a small black rocker switch under the tach that I don't know what it is for. Today I flipped it and tried to start the car and it failed to start. I flipped it back to the "left position" and tried to start the car and I had no power at the ignition at all. I suspect this is a alarm switch and the alarm system is faulty. How can I troubleshoot this crazy thing? I have parking lights, but no power at all on ignition switch. I checked all fuses and relays under the front hood and all fuses under the dash. I can't find any signs of a short or open wire.
November 4, 2014
  Followup from the Pelican Staff: Can you share an image of the switch? If it is an aftermarket alarm, you can remove it from the vehicle. - Nick at Pelican Parts  
John Comments: I have a 1984 Porsche 911, the rt. headlamp only works while on the high beem setting. The lt. Headlamp is working any help?
October 30, 2014
  Followup from the Pelican Staff: If it is only the right side, it is likely a wiring issue or a fuse. Check fuse 3 and 4. I think they are separate fuses for each headlight. GOing by memory. - Nick at Pelican Parts  
Brad Comments: My 1975 911s emergency brake light indicator in the dash flashes all the time when the ignition is on. It doesn't matter if the emergency brake is on or not. The light used to only come on when the emergency brake was engaged.
October 26, 2014
  Followup from the Pelican Staff: Try adjusting the switch at the handle. - Nick at Pelican Parts  
RyanC Comments: Hi, 74 911 targa with stock cis2.7. Lost the hot start wire for starter, horn, turn signals, either the high or low beam, back up lights and all but one marking light all at the same time. Everything was working prior to removing lenses for paint and body...now nothing. I ran a wire from the ignition/steering wheel to the starter thru the tunnel just to test the starter which works. Any ideas? Thanks so much.
October 13, 2014
  Followup from the Pelican Staff: I would think there is a blown fuse. Check the fuse panel, check the back of it for power going in on the main cables, then confirm the power goes out of the fuses. There may be a blown fuse or bad wire. - Nick at Pelican Parts  
Dee Comments: 87 Carrera, my headlights stopped working all of a sudden, high beam as well will not stay on. When I pull light lever back high beams function, but will not stay on without me holding it back only work when high beam flashing. Essentially my headlight switch worked, problem occurred when I tried to use my high beams, all of a sudden neither highs nor lows worked on their own. Got home by holding high lever on side of column all the way back. Any ideas, is there a relay or anything other than the switch in the steering wheel column? Checked fuse and it was fine. Don't think headlights burned out because highs work when I hold them on. Thoughts?
October 11, 2014
  Followup from the Pelican Staff: The yellow and white wires out of the dimmer should have power depending on high or low beam selection. If they do not, the dimmer switch is faulty. - Nick at Pelican Parts  
Hollywood Comments: I have a 74 carrera and the back up lights don't work.I put a new switch on i tried the wires the way they came off still did not work.I tried switching the wires still nothing fuse is okay is their a relay i should look at?If so where would i find it?Thank toy guy's you are very helpful.
October 4, 2014
  Followup from the Pelican Staff: s there power at the switch? What is the voltage? - Nick at Pelican Parts  
Dewey Comments: Thanks, Nick,follow up question: Can you tell me if the points stuck on, once they release, would car run or would it ruin the points? Car seems to run fine after issues, atleast this last time, previously coil was fried.
September 30, 2014
  Followup from the Pelican Staff: Points can stick, then release. So it may run fine once they release. I have seen, (its been a reeeeaaallll long time) points stick, cause a stall, then restart. - Nick at Pelican Parts  
Dewey Comments: 1975 Porsche 911S: The car's coil burned out 3 times and electronic box twice in 3 years. Symptoms prior to this: as car is going 35 - 75 mph, car appears to shut off, tach zero, momentarily then almost in an instant restarts. Occasional backfiring occurs.
September 28, 2014
  Followup from the Pelican Staff: I wonder if the points are sticking on, burning out the coil. - Nick at Pelican Parts  
Carlos AA Comments: Hi all: I have an 87 cab. The left side running lights are suddenly blowing the 5amp fuse. 8amp fuse also fails. 16amp fuse results in normal operation in the front left but dim light in the left rear. All turn, break and headlights work fine. Only change since they were working was I took out speedo to have it restored. It was replaced correctly. Any ideas? Thanks, Carlos
September 22, 2014
  Followup from the Pelican Staff: Your best bet is to inspect the bulbs and sockets for signs or burning or melting. Then following the harness and check for punched or chafed areas. - Nick at Pelican Parts  
Carlos Comments: 187 Cab: My left side running lights keep blowing the 5amp fuse. Headlights, turn signals and brake lights work. I inserted 8amp fuse and it blew. With a 16amp fuse in for a moment, the front left running light is fine, but the rear left running light is dim. Only change from when it was working was getting speedo calibrated and all speedo wiring as back to pre-removal. Any ideas?
September 22, 2014
  Followup from the Pelican Staff: Your best bet is to inspect the bulbs and sockets for signs or burning or melting. Then following the harness and check for punched or chafed areas. - Nick at Pelican Parts  
Paul Comments: I have a 1981 Porsche 928 with problems with the electric outside mirrors. The fuse is good and I get a single clicking sound when trying to adjust the mirrors, but no movement of the mirrors.
August 31, 2014
  Followup from the Pelican Staff: None of them moving seems the switch or wiring may be the issue. I would check the signal out of the switch to each mirror, then at each mirror. - Nick at Pelican Parts  
BillB Comments: I have a starting problem which i believe is a short or broken wire. It's not the battery or the alternator - checked with instruments at Advance Auto. It's not the starter itself - it cranks fine when i wired externally directly from starter and touched to positive terminal on battery. It's not the ignition switch - i bought a brand new one. The wire from the ignition switch to starter is yellow. I poked through the insulation with a straight pin and checked whether it was grounded. It was, with resistance of only 0.1, 0.2 Ohms. For comparison, i poked through the red/blk wire that goes to the instrument panel tach, etc.. It also showed connection to ground, but with a resistance of 6.5 to 7 ohms. Therefore, i think i have a short in the yellow wiring that goes to the starter, the DME, A/C relays, heater relays, and other. I tried to remedy by disconnecting components on the other ends such as the A/C relay. I got it to start a couple of times, but then it failed again. Meaurement of resistance to ground was after a few successful starts First, is my hypothesis/conclusion that I have a short in the yellow wiring reasonable? If so, how do I find it and isolate. I was thinking of cutting wires until the short went away so I would know which part of the circuit was shorted, but that seems a little drastic. On the other hand, i really can't inspect these wires throughout the reaches of the car. Any ideas?
August 29, 2014
  Followup from the Pelican Staff: If you suspect the yellow wire is faulty, is is easier to cut it at both ends and run a test wire to confirm your suspicion. - Nick at Pelican Parts  
Julian Comments: I just purchased a 1988 Porsche 3.2 and all the lights work expect the low beam headlights, I've tried looking to see if it the fuse but they all look fine..
August 15, 2014
  Followup from the Pelican Staff: I know it seems unlikely, but check the bulbs. I find two going out at once isn't that uncommon. - Nick at Pelican Parts  
bman63us Comments: 1988 Carrera: seat belt light comes on intermittently while driving.
August 11, 2014
  Followup from the Pelican Staff: Check the connection at the belt buckle. if it is good, the switch may be faulty. - Nick at Pelican Parts  
chasrb Comments: Just picked up a 1985 911 Coupe, the windows fuse blows often, I'll run the diags already written to troubleshoot, but I need to know are the windows and sunroof suppose to work with the ignition key off?
August 8, 2014
  Followup from the Pelican Staff: With the key off? No. - Nick at Pelican Parts  
stevebmd Comments: new to me 1978 sc targa. Directionals work fine, until i turn on headlights, then they don't work at all. Parking lights work on left front and rear but not on right front normally. Hazards work normally. Car is bone stock for electrical. this electrical stuff is new to this noob.
August 7, 2014
  Followup from the Pelican Staff: Sounds like a bad ground. I would check the grounds for the headlights and the turn signals. - Nick at Pelican Parts  
Ryan Comments: My headlights in a '74 targa does not work? Replaced it with a working relay from an SC. Still does not work. I didn't start the engine to test this halogen bulbs simply turned the ignition to second notch. Thoughts? Thanks
June 30, 2014
  Followup from the Pelican Staff: DO you have power to headlight bulb? If both are out and no power, check the fuses. - Nick at Pelican Parts  
Ant1972t Comments: The brake lights in my 1972 911 targa not working, have checked the fuses as well. Any suggestions?
May 18, 2014
  Followup from the Pelican Staff: Have you checked the brake light switch? Try using a fused jumper wire to jump out the switch, if the brake lights come on, the switch is likely faulty.- Nick at Pelican Parts  
Dugan Comments: Hi Nick,
Thank you for responding. I finally made the decision to take my car 1975 Porsche 900 SCinto Huskey Auto Electric and they were able to isolate the problem to #1 fuse on the first bank in the fuse box. The in voltage was 12v+ and dropped to 1.4v out. They replaced the fuse & cleaned the terminals. Everything works as it should, except that my indicator lights & relay work flash & clicking soundas soon as I turn on the ignition key. So I have too find the solution on my own. I think your service is awesome. Thanks for your help. Dugan
May 7, 2014
  Followup from the Pelican Staff: Thanks for the follow up. We appreciate it.
- Nick at Pelican Parts
 
Dugan Comments: RE: 1975 911: My Hazard warning switch must be engaged in order to operate turning signals, but the Hazard warning lights do not flash/nor light up on exterior of car. If I turn the Hazard swithc off, my turning signals do not work. Please advise - how to resolve issue. I have replace new Hazard switch and flasher relay.
April 28, 2014
  Followup from the Pelican Staff: There is a turn signal relay (if I remember correctly). I would locate it and check the ground to the relay, voltage supply and voltage out to turn signal switch.- Nick at Pelican Parts  
yayo_ayala Comments: hi,

What would be the correct amount of amps drain? Because there are things that always suck Amps like the clock.

thanks
April 27, 2014
  Followup from the Pelican Staff: No, less than 50ma should not drain the battery. - Nick at Pelican Parts  
vwvanaudi Comments: Forgot to mention that the fuse appears fine....
April 23, 2014
  Followup from the Pelican Staff: Thanks, got it. - Nick at Pelican Parts  
vwvanaudi Comments: My 1983 911SC Cabriolet windows have both stopped working simulatenously. I suspect it is a switch problem as I have swapped the relays out and the everything works except the windows as I swap all relays into all possible combinations. Suggestions please. It is a low mileage near mint car with no apparent wiring issues. Thanks.
April 23, 2014
  Followup from the Pelican Staff: There is a power window relay, this may be your issue. I would check to see if it working correctly. it is located in the right rear electrical panel in the luggage compartment. - Nick at Pelican Parts  
85targa Comments: 1985 911 Targa

It seems the clicking noise occurs even if my car had been sitting for a while, so long as the battery is connected. I found the clicking sound occurs everytime the passenger door is open. When I would manually press the door "closed" button the clicking would stop.

Aside from that, there are three red wires going from the positive terminal on my battery to my fuse box. Any idea what those 3 wires could be? It turns out disconnecting those three wires from the positive terminal stop my parasitic battery drain problem .8A drain wile off. One wire constantly drains .5 while the other drains .3. Any info you can direct me to or provide is greatly appreciated. PelicanParts is such an amazing resource!
March 29, 2014
  Followup from the Pelican Staff: Not sure. I don't have a wiring diagram for your vehicle. That would be the best bet, when trying to figure out what the wires are for. - Nick at Pelican Parts  
85targa Comments: After driving my 1985 911 Targa around, when I park and shut off the car, if my driver's side door is open with the keys removed from the ignition everything is quiet however, if I open the passengers side door I hear a strange "electrical clicking" sound coming from steering wheel or ignition or dashboard. Any idea what it could be? If I close the passenger side door, the clicking stops.
March 27, 2014
  Followup from the Pelican Staff: Could be a faulty warning buzzer. - Nick at Pelican Parts  
Dave Comments: I hear noise like a power surge when I turn on the ignition. I am connected to a tickle charger. Is that normal. I have a 1989 930 turbo cabriolet.
February 6, 2014
  Followup from the Pelican Staff: If the battery is weak and you are loading the charging, that could be the sound. - Nick at Pelican Parts  
Macor Comments: My 1986 930 tuns off the right side parking lights after a few minutes I have turn them on. This situation happens every time again. I have checked fuses and are ok. What may be the cause of such fault.
January 8, 2014
  Followup from the Pelican Staff: COuld be a faulty switch. Check if the lights are getting power when they switch off. If so, check the ground. - Nick at Pelican Parts  
Mawa Comments: Gauges Lights on the odometer and speedometer are lighting some times, some times not. Rest of the gauges works fine.
December 26, 2013
  Followup from the Pelican Staff: Could be bad bulbs of connection. I would inspect the bulbs as that is the easiest place to start. - Nick at Pelican Parts  
Larry Comments: 1982 911SC Targa
At the top of the oil temperature dial scale is an orange light. What does it mean if the light is dimly on? The owners manual does not describe this function.
November 10, 2013
  Followup from the Pelican Staff: If the oil temp is is normal operating range, the dimly lit light may be from a bad connection. If I remember correctly, the orange light was a warning light for a high temp.

I opened a post in our forums. A Pelican community member may be able to answer your question.- Nick at Pelican Parts
 
NYNick Comments: Update on wipers. I pulled the gauges and gave the mechanism a tap. Got them going. Lubed them up and they were fine....until the next day. Went on once and then wouldn't go on again. What's going on?
September 2, 2013
  Followup from the Pelican Staff: It's possible you have short circuit, an open wire or a bad connection. I would trace the wiper circuit with a wiring diagram, check for open / corroed wires or loose connections. - Nick at Pelican Parts  
NYNick Comments: My wipers don't work. We replaced the blown fuse, and they worked, but now they don't and the fuse is good. I can't imagine it's the motor, but it's almost impossible to test in place89 Targa. Any other test procedures suggested? Thanks
August 31, 2013
  Followup from the Pelican Staff: It's possible you have short circuit, an open wire or a bad connection. - Nick at Pelican Parts  
JP Comments: Hi - I have a 1978 Porsche 911, recently the electric rearview mirror switch stopped working and I am unable to adjust the side rear view mirrors.
Additionally the low beam headlights will not engage, the high beam headlights were fine. Moving the turn signal lever form high to low beam a few times resulted in no head light activity. The turn signals work as do the brake and running lights.Would appreciate your thoughts
August 22, 2013
  Followup from the Pelican Staff: Sounds like this could be a short. I would start by checking your fuses. If they are all OK, choose one item that is not working and trouble shoot the circuit. You will likely find the cuase to all the failures this way. - Nick at Pelican Parts  
Kwik Comments: Just bought 1980 911 SC. Air conditioner evaporator fan smuggler box and cooling fan under the nose not getting power. No light on console by 3 speed fan switch. Evaporator fan works if I apply 12 V. directly. All fuses look good, 12V on both sides of fuse. No change if I unplug and exchange AC relay with another at fusebox. Looking for AC wiring diagram, but just me and my multimeter for now.
August 21, 2013
  Followup from the Pelican Staff: I do know some of the early models had a separate relay for the condesnor fan.


I don't have wiring handy for your model. I opened a post in our forums. A Pelican community member may be able to answer your question. - Nick at Pelican Parts
 
DennisS Comments: After having my car stored for a few years, I went through the process of restarting it. Change plugs, change oil etc. It did start and run well. However smoke began to pour from the vents and I stopped the car. Upon investigation I found fried wires:all of the grounds to the instruments except the clock and the green / white wire that goes to a light on the gauge to the light switch. This is the cars first electrical problem. I can probably rewire things but my big concern is figuring out why this happened.
August 4, 2013
  Followup from the Pelican Staff: Rodents have been known to get into cars and chew on the wiring. I don't know what you mean by "all of the grounds to the instruments" Where the ground wires leaning on the engine or exhaust? Did they burn up without touching anything? If they did they were carrying too much current. Fuses should have blown to protect the circuit. The ground may have corroded and the drop in voltage increases the amp draw. Try cleaning all your grounds. - Kerry at Pelican Parts  
TARGA Comments: I think I have a problem with the factory alarm system on my 1984 911 carrera.I cannot find any wiring diagrams on what connections go back to the DME in order to keep the ignition system operating.The terminals at the DME would be helpful to determine if that is the reason the car will not start.Appreciate any info you can give me...Thankyou
March 10, 2013
  Followup from the Pelican Staff: When you try to start the vehicle, what does it do? Does it crank? I would begin by checking what is missing, starter signal, spark or fuel. - Nick at Pelican Parts  
horanoffp Comments: 1986 911. The two interior lights inside my car do not shut off when I close my doors. they worked fine a couple of monthe ago after I replaced the door switches. any ideas?
August 26, 2012
  Followup from the Pelican Staff: Push on the switches by hand and make sure the lights go out. Also make sure the switches on the lights are in the right position to go out with the doors closed. Someone may have accidentally moved them. Check to make sure the door is contacting the switches when they close. - Nick at Pelican Parts  
La Dentista Comments: 1977 Targa, What are the options for upgrading the fuse box ? new wiring harness ?
June 19, 2012
  Followup from the Pelican Staff: The plugs for the harness of the vehicle will only plug into that fuse box. Any modifications would require you to manually run many new wires. You would be practically rebuilding your harness. Get a good used fuse box and exchange it. - Nick at Pelican Parts  
Jeffkiwi Comments: Left hand flaher not working......Right hand good.any suggestions
April 30, 2012
  Followup from the Pelican Staff: More than likely you have a bad flasher switch - Nick at Pelican Parts  
Jimbones Comments: Re 1972 911: My flasher relay which operates the blinker, hazard, hand brake warning, is making the clicking sound but no lights are blinking on the dash or outside the car. Any idea? I suspect a short to ground somewhere in the 40 yr old wiring. Where should I start?
February 24, 2012
  Followup from the Pelican Staff: Follow the wiring leaving the flasher relay. Since all your lights are out the broken wire must be before it starts branching out to the rest of the car. If you had a short the fuse would blow first - Nick at Pelican Parts  

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