I have a metallic blue 1980 300D, Merc. the engines compression was low in two cylinders, so I replaced the engine with a 1979 issue 300D M. engine. The 79 engine has different spark plugs (filament type, and relay harness, and relay, and vacuum module on the top of the injector). I have both harnesses, and relay boxes, and injectors. How should I resolve the glow-plug-harness, relay problem especially. Thanks in Advance. Sure could use some help with this! James

I would suggest re-posting this in the Diesel section.

It is the most active forum on this site, and there are many people who I'm sure can answer your question.

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Paul S.

2001 E430, Bourdeaux Red, Oyster interior.
79,200 miles.

1973 280SE 4.5, 170,000 miles. 568 Signal Red, Black MB Tex. "The Red Baron".