First thing is to get your test light and see if the glow plugs are getting any current .
Then look at the rectangular black plastic box on the left inner fenderwell , the wires come out the front of it, be gentle removing the top , once you figure it out , it pops/slips right off .
When I lost a glow plug relay , the light occasionally flickered but NO current made it to the glow plugs .
I'd just go grab a used one , new they're $pendy little buggers .
I see they can be taken apart and the contacts cleaned and polished , I got lazy and replaced mine with a used one and tossed the old dead on in the trash bin .
There's a contact adjuster screw under the cover , loosen the 10 MM lock nut and use a thin flat blade screwdriver to adjust , sorry I haven't yet taught myself the correct adjusting method so be wary you don't get it stuck on and burn out your glow plugs and run the battery dead...
I'm guessing you can remove the adjuster screw and maybe polish it's inner end , Tom might remind me to take one apart in P-A-P next week.
-Nate
Who Knows Who Wrote :
I work on an 85 300D which suddenly quit starting, though cranking.
Simultaneously, it doesn't turn on the glow plug light.
Are these related?
Where exactly is the glow plug relay?
Apparently the 80A fuse is there, so that might be the problem...
Thanks for any help...
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