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Old 06-05-2001, 03:49 PM
Registered User
Join Date: Jan 2001
Location: San Francisco
Posts: 26
Does anyone know the real deal on w140 wiring harness??

I have heard from several independent mechanics that these should be replaced on my 1995 s420 because of factory defects. My dealer refused to change my harness (which is still under warranty) because they assert that their visual inspection did not result in a reason to change it. One of my mechanic friends said that I should have it changed because a defective one could fry the controller modules.
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Old 06-05-2001, 05:06 PM
Join Date: Sep 2000
Location: Sugarland, TX
Posts: 285
My engine wire harness (95 S320) was replaced by MB. The engine wire harness insulation become hard, due to heat for the engine, and type of wires used by MB.

I suggest you to look over all the wiring under the hood, I am sure you will crack wiring.

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Old 06-10-2001, 09:55 AM
MBenzNL's Avatar
Join Date: Jan 2001
Location: the Netherlands
Posts: 1,417
The wiring harness that mercedes used to put under the hood of their MBs during the early 90s suffer a lot from hardened insulation and connectors. These hardened parts crack as soon as you touch them and therefore some of these engine wire harnesses are changed under warranty...
I renewed some parts of the engine wire harness in my 1990 300SL-24 as well. A lot of broken connectors and cracked insulation parts...

1990 300SL-24
1993 C250D
with a minor 600+k kilometer
(the Netherlands)
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