Mercedes-Benz 400E Problems

Electrical Issues Due to Degraded Engine Wiring Harness on Mercedes-Benz 400E

Problem Description and Possible Solution

The engine wiring can degrade because the insulating material falls off leaving the bare wire exposed. This can cause many problems depending on which wires are exposed and what they touch.

(7 people reported this problem)

Mercedes-Benz 400E Vehicles With This Problem

RepairPal Verified
Average mileage: 183,000 (180,000–187,000)
2 model years affected: 1992, 1993
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While trying to find a vacuum leak causing the car to run rich and transmission to shift incorrectly I noticed bare wires running along the frame of the car by the exhaust manifold. unfortunately by moving things around I found out the next time I drove it it shorted and caused the car to stall and run crazy all kinds of noises coming from underneath the hood definitely not good I had to trace them out and figure out where they were going, they turned out to be the alternator wires running from the alternator to the computer control box they also controlled the oil pressure unit the ASR system and something else I can't remember what it was, but I ended up rewiring one-by-one running new wires I had to because I couldn't find a harness so I made my own which worked just as good, being an electrician I have the ability to do that, now I have to go back to finding that vacuum leak, thanks to you guys and other websites like yours I'm able to find these problems and fix them easily thank you