There could indeed be a whole load of very irritating plugs that don't fit - but I doubt if a wiring diagram or people's experiences could pre-warn you of that.

I can say that the whole wiring loom for my W201 (1992 vintage) can be unravelled from the electronics boxes hidden behind the battery - I can then make a very big assumption and guess that the W124 is probably arranged in a similar way; assuming the worst happens then you should be able to unhook the engine loom from one car and transplant to the other.

Have you got EPC? If so you can see specific data for the specific VINs

Looking at the EPC parts diagrams on EverythingBenz - Mercedes-Benz Forum and Web Search Using Google might also yield a warm wet feeling!

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1992 W201 190E 1.8 171,000 km - Daily driver
1981 W123 300D ~ 100,000 miles / 160,000 km - project car stripped to the bone
1965 Land Rover Series 2a Station Wagon CIS recovery therapy!
1961 Volvo PV544 Bare metal rat rod-ish thing

I'm here to chat about cars and to help others - I'm not here "to always be right" like an internet warrior



Don't leave that there - I'll take it to bits!