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  #16  
Old 12-13-2007, 09:05 AM
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These harness were made with bio-degradeable insulation and degrade by design..the problem is they did not calculate the ambient heat and humidity conditions correctly and the insulation degraded way before they wanted it to.
All of these degrade..... how long it takes is dependant on the conditions each is exposed to.
Every time I see the new "Green" Toyota commercial with their lapse time chassis returning back to Mother Earth I think of how far ahead Benz design was with their wire harness...trouble was they were TOO far ahead this time and their clock was running too fast....

I have a Tech friend who works on Jags of the same time vintage and he told me he has had to change whole chassis harnesses... terrible job.


Last edited by Arthur Dalton; 12-13-2007 at 09:42 AM.
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  #17  
Old 12-13-2007, 10:48 AM
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Originally Posted by 85MB300D View Post
Will ALL 1990s W124s need to have this done? Or only certain years and models?

How can you tell if it has been replaced or not?

Thank you!
Check out the attached picture that shows an "easy" place to inspect the wiring harness. It's NOT the best place but is easily done and will give you an real-world check to see if the wires are bad or starting to go bad.

Remove the front facade by lifting up and locate the farthest sensor on the right.

If it's 'bad' there, then it is in worse condition at hotter places. It needs to be replaced.
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1994 E420 - How can you tell if wiring harness has been replaced?-eng_harness_inspection.jpg  
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Last edited by JimF; 12-14-2007 at 10:38 AM.
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  #18  
Old 12-13-2007, 07:17 PM
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That sensor was the first place I noticed that the insulation on the wires was deteriorating. I think the insulation on the wires there is probably a fair and accurate representation of what you could expect for the rest of the wiring harness.
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  #19  
Old 12-13-2007, 08:33 PM
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Quote:
Originally Posted by JimF View Post
Check out the attached picture that shows an "easy" place to inspect the wiring harness. It's NOT the best place but is easily down and will give you an real-world check to see if it's bad or starting to go bad.

Remove the front facade by lifting up and locate the farthest sensor on the right.

If it's 'bad' there, then is in worse condition at hotter places. It needs to be replaced.
Amen, and that should settle that.

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