Lifetime Premium Member
Date registered: Mar 2013
Vehicle: 1959 190SL, 1970 220D, 1991 300SEL, 2002 CLK55
Location: Skowhegan, ME & Haddam, CT
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Sounds to me like you've got a pretty common "upgrade" for the diesel starting system; a mod that changes the starter switch, the glow plugs to the "fast start" type, the relay you speak of to handle the switching load, the push to start button (which needs that relay) and much quicker starts. There are several ways to wire this, like using the original position on the start switch instead of the button, but they present several problems as well. For a good explanation visit "mercedessource.com", who sells the mod I think you have. It's a GREAT site for purchasing all sorts of items, learning how to maintain your Benz and reading about maintaining and repair of your car by a fellow who is right on top of the knowledge heap. Check it out!!