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Old 10-12-2009, 08:00 PM
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Join Date: Aug 2008
Posts: 212
Unhappy SL500 1995 Replace upper wiring harness

Anyone do this themselves? Anyone have any instructions or tips? Anyone have any ideas where to obtain the upper harness outside of the MB dealer?

Just inspected mine and the wiring is cracked and brittle and having all kinds of problems with ASR and check engine light. Can't fix the problem without replacing this harness because its soo bad.

Thanks, Steve

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Old 10-12-2009, 08:59 PM
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Join Date: Jul 2001
Posts: 899
I don't know the SL's at all, but presumably this is an M119? If so, upper harness replacement is not a bad job for a reasonably skilled DIY'er. Just take lots of pictures before you remove the old harness, so you can remember the routing. Do the job in a well lit garage, with no deadlines.

I did the job slowly and deliberately, basically making sure I had every connector correctly placed and routed. I had my laptop with photos set up right on the fender. Some of the injector wiring clamps are fiddly, and you may break a plastic routing clamp or two because they are so brittle, but that is no big deal. And getting the main harness through the firewall takes some pushing and shoving, but it is doable. The clamp through the firewall itself has like interlocking fingers, I will see if I can find a picture and put it up here - after my wife is done with our other computer!

Here is a photo of the clamp. It has interlocking fingers/tabs which interlock with tabs on the firewall. Undo the screw and lever up the whole clamp at which point it should come free from the firewall and then you can open it.

It probably took 3-4 hours, but I could do it again in less than 90 minutes.

Chris W.
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SL500  1995 Replace upper wiring harness-100_3942-compressed.jpg  

Last edited by Chris W.; 10-13-2009 at 07:41 PM.
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Old 10-23-2009, 05:13 PM
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Join Date: Aug 2008
Posts: 212
SL500 replacing wiring harness

Chris thanks for the pic of the interlocking wiring harness clamp. I don't know that I would have figured that out. Just ordered my harness, I'll start on it in another week or so. In the mean time, anyone else out there have any advice or picturs of the SL500 to share? I am concerned with taking the wiring off of the injectors. Not sure how they are attached, anyone help me with that? Thanks steve
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Old 10-24-2009, 06:32 AM
Pete Geither's Avatar
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Join Date: Feb 2002
Location: Western Pa.
Posts: 2,417
When you get the new harness it will become obvious how things attach. I changed out the harness on a 400E in less than an hour,,,,, very easy job.
95 SL500 Smoke Silver, Parchment 64K
07 E350 4matic Station Wagon White 34K
02 E320 4Matic Silver/grey 80K
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Old 10-24-2009, 10:49 AM
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Join Date: Aug 2008
Posts: 212
1995 SL500 Removing the Electric leads from a fuel injector?

Any suggestions? Not sure how they are held in place and to remove. Also, How are fuel injectors held in place? Are they screwed in or someother method? Can or should these be removed and do they require cleaning of any sort while I have the wiring harness off? Thanks to Pete for your response on the rewiring effort.

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