Put a 1985 300D glow plug system on older 1978 300D
 

I've read a lot about the conversion kits for upgrading the loop style system to newer style system. I have a 1978 300D in the garage now. I found the kit on fast lane. http://www.peachparts.com/shopforum/mercedes-parts-reference-library/178765-f1101-88322-kit-converting-loop-series-gp-hotter-pencil-parallel-system.html

Does that kit have an after glow relay? We need after glow.

I have a newer style glow harness and afterglow relay from a parts car lying around. Why i couldn't just hook that up like the newer cars have it? I haven't seen what the existing relay looks like . But i may have to run some wires from it under the dash to under the hood to hook up to the relay.

Anyone done that? I didn't see any posts about it. Thanks

that should work fine.

the wiring is pretty simple, large wire feeding the relay, control wire to the relay, one to the starter circuit, hmm, there is 4 wires feeding the relay... one to the glow light on dash?

the kit likely has all the instructions to wire this. If you have a diagram from the 85 to see where all the wires go, you shouldn't have problems wiring it up.