Mercedes-Benz Parts Catalog Mercedes-Benz Accessories Catalog Mercedes-Benz Technical Articles Mercedes-Benz Tech Forums
 
Follow Pelican Parts on Facebook Follow Pelican Parts on Twitter Follow Pelican Parts on Instagram Follow Pelican Parts on YouTube Follow Pelican Parts on Pinterest Follow Pelican Parts on Tumblr
  Search our site:    
View Recent Cars  |   Cart  | Project List | Order Status | Help    
 >  >
Battery Connection Notes and Replacement
 
Bookmark and Share

Pelican Technical Article:

Battery Connection Notes and Replacement

Steve Vernon

Time:

30 minutes30 mins

Tab:

$140

Talent:

*

Tools:

13mm wrench, 13mm socket and extension

Applicable Models:

Mercedes-Benz W124 (1990-95)

Parts Required:

Battery

Hot Tip:

Wear eye and hand protection

Performance Gain:

Car will start well

Complementary Modification:

Purchase extra emergency fuses

Batteries in modern cars are an integral part of not only the engine management system but also heavily involved in both the computers and security systems. Having a properly charged and maintained battery is crucial to the operation of the vehicle. Proper flow of the electricity involves proper and working fuses. If you are having electrical problems with your car you should check your fuses first.

The next item to check is the voltage at the battery. Before performing any tests of your alternator, charge and test your battery. If the battery is faulty, your alternator tests will not be accurate. This should read a little more than 12 volts with the engine off. Next check the voltage of your charging system under load, the voltage should be within 13.2: 14.5 volts d/c. To load, have the engine running at idle, turn on the headlights and HVAC blower motor. Never disconnect a battery cable while the engine is running to test the alternator. You may cause damage to the alternator or other electrical components from the surge in amperage. If your battery appears to be leaking, your voltage regulator has probably failed.

The battery will usually only leak acid if it has been overcharged at a much higher voltage. If the voltage measured at the battery is more than 14.5 volts when the engine is running, then the regulator is probably bad. If your battery has boiled over and has acid overflowing out the top, make sure that you clean up any spilled acid immediately. Dousing the area with a water and baking soda solution should help considerably to neutralize the acid, and prevent it from eating away at the metal.

As important as the positive side of the battery is to supplying the correct voltage, the negative or grounds are an integral part of the system. There are main grounds found in all of the cars systems and sub systems. A bad ground in any of them can cause problems. When checking for electrical problems the grounds and ground straps are a great place to start. NEVER disconnect your ground strap with the engine running; you can severely damage electrical systems in your car,

Before disconnecting your battery, remove the key from the vehicle and store it in a safe place and note radio presets. You may have to reset your clock, enter radio presets, initialize power windows, initialize the sunroof and normalize the steering angle sensor.

Jump Starting Vehicle:

A vehicle with a discharged battery can be jump started using a good battery or a good battery in another vehicle. When jump starting: Be sure to work in a well ventilated area. Batteries can produce an explosive gas. Wear gloves and eye protection. If battery acid comes in contact with your skin, immediately flush with water and seek medical assistance.

Move both vehicles close together but do not allow them to touch. Turn the ignition OFF in both vehicles.

Connect one end of the positive jumper cable to the positive (+) battery terminal of the vehicle with the good battery. Connect the other end of the positive jumper cable to the positive (+) junction terminal (red arrow) vehicle with the discharged battery. Connect one end of the negative (-) cable to the negative (-) battery terminal of the vehicle with the good battery. Connect the other end of the negative (-) jumper cable to the negative (-) junction terminal (red arrow, picture 3) of the vehicle with the discharged battery, if the main battery ground strap is in good working order.

Start the engine on the vehicle with a good battery. Allow it to idle, then raise the engine speed to 2,000 RPM. Next, start the engine of the vehicle with the discharged battery. Once the vehicle with the discharged vehicle starts, shut OFF any electrical accessories, radio, HVAC blower, etc. Carefully disconnect the jumper cable in the reverse order you connected them in. Allow the vehicle with the dead battery to idle to recharge the battery.

Long term storage and trickle charge:

If you are going to long term, trickle charge your battery. It is a good idea to remove it from the car.

The battery is located under the hood at the rear of the engine compartment on the right side (red arrow).
Figure 1

The battery is located under the hood at the rear of the engine compartment on the right side (red arrow). PLEASE NOTE: '96 E320 battery is located under the rear seat. 

The battery powers the electrical system to the car by a positive (yellow arrow) and negative (red arrow) connections and cables.
Figure 2

The battery powers the electrical system to the car by a positive (yellow arrow) and negative (red arrow) connections and cables.

If you are going to be working on your vehicle and just want to disconnect the power to it you only need to remove the negative or ground cable.
Figure 3

If you are going to be working on your vehicle and just want to disconnect the power to it you only need to remove the negative or ground cable. With the ground cable unattached no electricity will be flowing in the car. Use a 13mm wrench (red arrow). Verify you are working on the negative or ground cable (yellow arrow) and disconnect the cable. Make sure the cable cannot accidentally make contact with the battery ground post while working on the car.

If you are going to be removing or replacing the battery, you will need to use a 13mm wrench and disconnect the positive connection (red arrow).
Figure 4

If you are going to be removing or replacing the battery, you will need to use a 13mm wrench and disconnect the positive connection (red arrow).

There is a mount at the front of the battery securing it to the tray.
Figure 5

There is a mount at the front of the battery securing it to the tray. Use a 13mm socket and extension and remove the nut (red arrow).

Remove the nut and bracket from the vehicle (red arrow).
Figure 6

Remove the nut and bracket from the vehicle (red arrow).

Use the handles (red arrows) on the battery and pull it straight up and out of the vehicle.
Figure 7

Use the handles (red arrows) on the battery and pull it straight up and out of the vehicle. Batteries are full of acid and can leak and spill. Make sure to use caution and do not spill anything on yourself or the vehicle when removing the battery.

With the battery removed you can inspect the tray and area around where the battery sits.
Figure 8

With the battery removed you can inspect the tray and area around where the battery sits. Clean up all of the dirt and debris in and around the tray (red arrow). Inspect the area for any damage that may have been caused by leaking acid or rot. There are several wiring harnesses that run beneath the tray (yellow arrow); inspect these carefully especially if there has been any leaking battery acid. Installation is the reverse of removal.



Bookmark and Share
Comments and Suggestions:
Hal Comments: 96 e320 battery is under the rear seat
February 11, 2016
  Followup from the Pelican Staff: Thanks for the additional info. We appreciate it. I will have the article updated.
- Nick at Pelican Parts
 
oldtrucker Comments: Hi, nice article.
I have been trying to find out what the original Battery capacity of an E320 95 was, without any success so far. Perhaps one could create a table with some of the original Battery data.
I believe, the original for the E320 was a 75AH sized battery. Not sure though and it seems it also depends on the size of the Alternator, which I believe to be a 90 Amp unit.
Thanks!
August 18, 2014
  Followup from the Pelican Staff: Most battery manufacturers have this listed on their websites. - Nick at Pelican Parts  

  Search our site:    

View Cart & CheckOut | Project List | Order Status |  Help    

 

[Home] [Customer Service] [Shopping Cart] [Project/Wish List]
  [Privacy Statement]  [Contact Us] [About Us] [Shipping] [Careers]

Copyright © Pelican Parts Inc. -    DMCA Registered Agent Contact Page

Page last updated: Wed 12/7/2016 02:59:17 AM