Engine Wire Harness Compatablity 92 400E and 94 E420 ??
Without looking at both harnesses that you have I'm thinking, no, they aren't interchangeable due only to the differing part numbers. But who knows, if you lay them next to each other they may actually be the same.
Unless the used 92' harness is like $10...I'd advise not wasting any time with it. A new harness (made after 1996) is what you want. Less than $500. I think there are 17 connectors (at least on a 500E with ASR there is) ...takes about an afternoon to switch them out in the garage/driveway (pretty easy).



