Home » Forums » Tech Help Forum » Diesel Engine Specific

76 300d glow plug upgrade wiring?

Submitted by 8ball on 11 July 2008 - 9:17am.
I have installed the pencil tip glow plugs in my 115. How do I connect the wires from the car? The manual with the plug kit is for the 123 and I didn't see anything about the wire at the front of the engine that is from the thermo time switch(I think) in the head that was connected to the front glow plug. Do I connect that wire? Where? Thanks, Vince
‹ 300D Hard Start Hot and Sporadic Power Loss? My 1985 300td wagon will not idle ›

Do not connect to thermal time switch

14 July 2008 - 4:25pm
Kent Bergsma
The thermal time switch is the same as the ground on a early 123 diesel with series plugs. DO NOT connect the that switch. It can no longer be used when you convert to pencil glow plugs wired in parallet.