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My wiring harness lasted over 225,000 miles. Actually, nothing went wrong with the car, electrically, but once I finally checked the insulation, I noticed it was completely shot.
I still had the original harness and I noticed that there is a rubber sleeve on the new harness, near the lever-type connector, that does not exist on the original. I think the new harness was purchased from mercedesshop. This may be a long shot, 85MB300D, but if the harness on your 420 has the rubber sleeve, maybe it's a replacement. On the other hand, if it was replaced with a factory part, maybe you wouldn't see the sleeve.
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1993 400E, 256,000 miles (totaled)
1994 E420, 200,000+ miles
1995 E420, 201,000 miles
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