85 300d glow plug please help - Mercedes-Benz Forum

 
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post #1 of 2 (permalink) Old 11-23-2004, 03:37 AM Thread Starter
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Date registered: Mar 2004
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85 300d glow plug please help

HERE IS WHAT HAPPENED.Last night I went to close my sun roof.I turned the key all the way on-about an hour I forgot to turn it off.I then started the car and it was fine.This morning I went to start the car and i had no glow-plug light.So I checked the fuse in relay and it was blown.I replaced the fuse turned the key glow plug light lit up and than blew the fuse.I than diconnected the harness to the glow plugs --the fuse held fine--I than put plug back on fuse blew.so does this mean bad glow plugs or is relay bad.or any suggestions you have.as I said I took the plug off that goes to glow plugs and the fuse does not blow. That is making me think it's glow plug. can they short out causing fuse to blow?
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post #2 of 2 (permalink) Old 11-23-2004, 11:29 AM
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RE: 85 300d glow plug please help

one thing about glow plugs are they are very sensitive and fragil, you can easily unscrew the glow plug and test it out with 12 volts plus ground, do it in the dark, if it gets hot or starts to glow disconnect it from 12 volt source quickly so you don't burn it out in the open air. their easily replaceable anyway in case. another test is you can leave it in cylinder head disconnect wire take a seperate 12 volt source touch head of plug if you get a spark no good it's burnt. good luck.
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