Originally Posted by Beirut Brit

To clarify, it's a diesel engine - the OM603 - so it doesn't have spark plugs. Im sure people here want to help but I also need them to be flexible and understand that im in morocco and the VIN number on the front of the car really doesn't mean anything. I checked with the VIN sites and got two different answers. It's a W126 which might have started life as a 500 SE but, according to one VIN website, came out of hte factory in dec 1984 as a SDL five cylinder diesel automatic.

Would it make any difference to this specific problem if it were orignally a 500 SE even though i have a diesel engine in it?

I can assure you that i'm not confusing anyone by "intent". Can't think how you would think such a thing. I have a W126 long wheelbase car which it seems has gone through many identity overhauls. Im always grateful for any advice on my frankenstein jallopy.

Your advice is excellent. Yes, i should see if there is continuity between the ground in the plug and the ground on the steering column. But any idea which number terminal in that plug is the ground? Thanks

MJ