'76 300D Glow Plug issue - Mercedes-Benz Forum

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post #1 of 1 (permalink) Old 05-02-2013, 06:04 PM Thread Starter
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Date registered: Mar 2013
Vehicle: 1976 Mercedes 300D
Location: Alberta, Canada
Posts: 32
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(Thread Starter)
'76 300D Glow Plug issue

Hey guys, looking for some suggestions regarding an odd glow plug issue on my 76 300D
Here is what happens....
Put key in, turn to pos 2, glow plug light comes on...wait 30 seconds or so, glow plug light goes out, crank engine and it starts fine.
After approx 1 minute of the engine running the glow plug light starts to faintly flicker and within another minute it is on bright.
Leaving the engine running with the light on, when the engine temp reaches 175, the bright light starts to flicker and slowly dims until it goes out completely.
The light will now stay off as long as the engine is running.

The engine seems to be running fine during the light off/on/off stage.
Car is in a garage, temp is 10-15c
Pretty sure the battery needs replacing

Im waiting on a factory manual to show up in the mail, I have been searching the internet and forums but havent come across this same issue.

To me it seems like some sort of temp sensor issue, but I really have no idea.
Any help would be appreciated
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