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Replacing Your Coil on your Mercedes-Benz
 
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Pelican Technical Article:

Replacing Your Coil on your Mercedes-Benz

Steve Vernon

Time:

30 minutes30 mins

Tab:

$85

Talent:

*

Tools:

10mm wrench, flat head screwdriver

Applicable Models:

Mercedes-Benz W126 (1981-91)

Parts Required:

Ignition Coil

Hot Tip:

Always disconnect the battery

Performance Gain:

Better running engine

Complementary Modification:

New plugs and wires

I always like to disconnect the battery when working on the electrical components of the car and replacing the coil is no different. While there is very little chance of something going wrong while you are replacing the coil, it never hurts to be safe.

If your coil has gone bad, don't worry, replacing it may be one of the simplest things you can do and will allow you to be back on the road in no time.

The coil is located on the left side of the engine and is secured to the inner fender. Begin by removing the weather protective cap on the coil. Just use a large screwdriver and gently pry it open.

With the cover off all you need to do is label which wire goes where and use an 8mm and ten mm wrench to remove the wires. Pull the distributor cap wire off the top as well.

Next you can loosen one of the 10mm nuts securing the bracket to the firewall. The coil will now slide out from the top. Install your new coil, hook up the wires in the right order, place the protective cap back on and you are done.

Begin by removing the ground cable from the battery and making sure it can not accidentally come in contact with it while working.
Figure 1

Begin by removing the ground cable from the battery and making sure it can not accidentally come in contact with it while working.

Remove the weather protective cap on the coil.
Figure 2

Remove the weather protective cap on the coil. Just use a large screwdriver and gently pry it open (yellow arrow).

With the cover off all you need to do is label which wire goes where and use an 8mm and ten mm wrench to remove the wires (green arrows).
Figure 3

With the cover off all you need to do is label which wire goes where and use an 8mm and ten mm wrench to remove the wires (green arrows). Pull the distributor cap wire off the top as well (red arrow).

Next you can loosen one of the 10mm nuts securing the bracket to the firewall.
Figure 4

Next you can loosen one of the 10mm nuts securing the bracket to the firewall. The coil will now slide out from the top. Install your new coil, hook up the wires in the right order, place the protective cap back on and you are done.

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Comments and Suggestions:
Larry Comments: I replaced my coil on my 1978 Mercedes and it is so hot to touch is that normal I put the right one on and the wires put on right.
September 16, 2016
  Followup from the Pelican Staff: When the vehicle is running? That is normal. - Nick at Pelican Parts  
Drew Comments: It is a 1983 380sel with the 3.8 v8 gasoline engine.
August 18, 2016
  Followup from the Pelican Staff: You got lucky, I usually don't have info that far back.

Firing order is 15486372, right side is bank 1, cyls 1-4.

Wiring diagram attached.
- Nick at Pelican Parts
Drew Comments: He took off all ythe wires and left them loose so I don't know what wire goes where.
August 18, 2016
  Followup from the Pelican Staff: You got lucky, I usually don't have info that far back.

Firing order is 15486372, right side is bank 1, cyls 1-4.

Wiring diagram attached.

- Nick at Pelican Parts
Drew Comments: Had someone working on my 380SEL and they took the wires off the coil and never finished the job. So my question is what wires go where?
August 18, 2016
  Followup from the Pelican Staff: What year and engine? Which wires exactly(primary or secondary)? - Nick at Pelican Parts  
ted Comments: It turns on, sometimes gives me trouble and takes a few turns of the key but sometimes it cranks up easy... Runs and drives awesome... Just cutting it on at times makes me feel like no spark and the starter turns... Or fuel delivery... But no problems after its on hitting the gas... And how do I check the spark output from the coil?
March 4, 2016
  Followup from the Pelican Staff: You can use a spark tester to monitor spark output, or monitor primary and secondary ignition using a lab scope. - Nick at Pelican Parts  
ted Comments: How can I tell if my coil is bad? I think mine is going out due to hard starts and the engine not turning over...
March 3, 2016
  Followup from the Pelican Staff: Check the spark output. Should be able to make 25Kv. - Nick at Pelican Parts  
Badness Comments: How much does the coil and etc cost
August 3, 2014
  Followup from the Pelican Staff: Give our parts specialists a call at 1-888-280-7799. They can help you find the right part.
- Nick at Pelican Parts
 

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