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Looks like I just had it confirmed that my wiring loom might be of the useless kind...
I've checked all visible wires under the hood though and I'm yet to find anything cracked, but that doesn't mean I'm spared. Bet you've done your fair share of googling as well on this, do you know if it's every model between 92 and 98, or just a few? Guess this could've been the issue with yours as well, I recall you had a lot of random electric issues?
Also, if all looms between 92 and 98 are kaput, and the paint was water based from 95 all the way in to the early 00's, that means I need to find a w124 pre 92 if I want to stick to mercs... Or just bite the bullet and sort mine out
kboy-
Mine, in the end turned out to be a bit more low tech. It needed a new Dizzy cap and rotor.
I sold it before I found out what was causing the engine to turn off when idling.
The wiring issue I thought only affected the M104 2.8 and 3.2 but the 4 cyl is related, so it could be that. I guess 4 cyls run cooler so it's not as common.
bq
Mine was fantastic when it worked. Loved it.
There's a relay which causes your problem if it needs replacing/cleaning up. Well known issue.