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Common Engine Ground Strap Problems on the Mercedes-Benz
 
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Pelican Technical Article:

Common Engine Ground Strap Problems on the Mercedes-Benz

Steve Vernon

Time:

30 min

Tab:

$20

Talent:

*

Tools:

10mm wrench

Applicable Models:

Mercedes-Benz W126 (1981-91)

Parts Required:

New ground strap

Hot Tip:

Check it first when having electrical problems

Performance Gain:

A functioning electrical system

Complementary Modification:

Check your other grounds

If you are having any sort of electrical problem, from a battery not charging to intermittent switches or lights, one of the first things you should do is check your engines ground. The engine is isolated from the frame of the car by the mounts and needs a good ground for the electrical system to function properly. The ground strap provides this, but it is exposed to the elements and does corrode and or become loose over time.

Always check or replace your ground strap first, before replacing any electrical component on the car.

The ground strap for the W126 is located in the engine bay on the left side. It connects to the back of the power steering bracket on the engine side and to the coil mount on the chassis side. If it is corroded, full of dirt, loose or just really old, you should replace it and clean its mounting points. It is also a good idea to apply a little dielectric to the connection points.

This photo illustrates where the ground strap connects to the back of the power steering bracket (red arrow) on the engine side and to the coil mount (green arrow) on the chassis side.
Figure 1

This photo illustrates where the ground strap connects to the back of the power steering bracket (red arrow) on the engine side and to the coil mount (green arrow) on the chassis side.

Here you can see the corrosion (red arrow) in both the strap and mount.
Figure 2

Here you can see the corrosion (red arrow) in both the strap and mount. Make sure you clean the mounting area before installing a new strap.

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Comments and Suggestions:
Austin85 Comments: Are the ground straps in the same location on my grey market 1981 280SEL ? If not do you know where it is? Any other ground points to look over or just these two on this strap?
May 26, 2017
  Followup from the Pelican Staff: They should be in similar locations. - Nick at Pelican Parts  
Gil Comments: Nick-
Thank you for trying to help me! Just a little effort from you was really appreciated by me. It has been really frustrating to track down any kind of information about how to pull this unit out of the steering column. The problem for me seems to be the Allen screw buried deep inside the part; just have to keep after it.

Gil Lusk
Knoxville, TN
May 7, 2016
  Followup from the Pelican Staff: it may require a long ball head Allen? Can you see or share a photo of the piece? I'm happy to try to get this done with you. - Nick at Pelican Parts  
Gil Comments: Am I the only 1985 380SL owner who is having trouble removing the horn brush assembly from the steering column so I can replace it? Surely not! If there is anybody in this forum who knows how it's done, please tell me how to contact you. Thanks.
May 6, 2016
  Followup from the Pelican Staff: I opened a post in our forums. A Pelican community member may be able to answer your question.


We don't currently have that tech article. If we get a chance to perform the procedure, we will be sure to document it.

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
 

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Page last updated: Fri 6/23/2017 02:29:20 AM