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Old 01-06-2010, 04:22 PM
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Join Date: Nov 2009
Location: San Diego. California
Posts: 2
Glow plug light comes on but plugs don't work...

If anybody has any pointers on this I'd greatly appreciate it...

The dashboard glow light comes on per normal but does not turn off -plugs are not heating.
I pulled what I believe is the relay off and cleaned the contacts, checked all fuses, etc. (on my '76 300d the relay sits under a fuse bracket on the driver's side, yes?)
The car started after this, though I'm not entirely sure I really did anything.
Ran fine for an afternoon and a 20 mile drive but once again, a glow light and no start the next day.
Also, I have a frayed short ground wire on what I assume is a thermostat (2" blk cap that screws into side of block, wire goes to 1st GP)

I realize that this is all probably very elementary, but once again, I've never worked on GP's previously.
Anyone have any starter advice as how to go through the system?

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Old 01-06-2010, 04:39 PM
Registered User
Join Date: Jan 2002
Posts: 18,356
Check your plugs. Loop plugs are OE on your car. If one goes out, they all go out. Your system also needs a ground wire. If the wire you reference is the main ground and it is not functional it would account for the system not working.

1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13
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