Hey, don't worry about these guys saying everything's on the wrong side. What do they know? They even call the bonnet the HOOD. (bg)

Actually I had an 87 200 w124 and I think, though at my age God know's if I'm right, I believe the resistor thing discussed was on the ignition module, just to the left of the diagnostic socket.
You can just see it in your photo. I seem to recall it was a small round plug, about 10-12mm in size.

Just my tuppence worth.

Barry

E200 Wagon 1994 119k miles