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#1
08-23-2009, 12:53 PM
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Glow Plug light?
My glow plug light is not coming on at all. Is this a bulb problem? Or is the lack of a light indicative of another problem.
The dome light dims and I can hear the relay click off after about 25 sec. But, no glow plug light?
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AJ 1985 300D (SOLD) 
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#2
08-23-2009, 12:56 PM
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Could be burned out or the connection is bad. How does the car start when cold? Assuming you're in Florida and right now it's probably very hot there so starting probably isn't an issue anyway.
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DJ 84 300D Turbodiesel 190K with 4 speed manual sold in 03/2012 
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#3
08-23-2009, 01:00 PM
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It starts fine and idles smooth. I used to always wait about 5 seconds or so after the light went out anyway.
What are the other possibilities of a no light condition besides the bulb? Are you talking about the connection at the bulb or somewhere else? Thanks, AJ
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AJ 1985 300D (SOLD)
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#4
08-23-2009, 01:24 PM
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I'd replace the little rice bulb and then go from there.
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1985 300TD Turbo Euro-wagon 1979 280CE 225,200 miles 1985 300D Turbo 264,000 miles 1976 240D 190,000 miles 1979 300TD 220,000 GONE but not forgotten 1976 300D 195,300 miles 1983 300D Turbo 175,000 miles http://i42.photobucket.com/albums/e3...e485-1-2-1.jpg
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#5
08-23-2009, 01:43 PM
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Quote:
Oh well.... So, you think its the bulb huh?
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AJ 1985 300D (SOLD)
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#6
08-23-2009, 01:46 PM
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It's probably the bulb. If one of the GP's were burned out it would miss for a few seconds after you started the car cold.
The GP light in my 300D didn't come on but the car started fine, replaced the bulb and all was well.
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1985 300TD Turbo Euro-wagon 1979 280CE 225,200 miles 1985 300D Turbo 264,000 miles 1976 240D 190,000 miles 1979 300TD 220,000 GONE but not forgotten 1976 300D 195,300 miles 1983 300D Turbo 175,000 miles http://i42.photobucket.com/albums/e3...e485-1-2-1.jpg
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#7
10-20-2009, 03:16 PM
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Thanks again for the help with this one. I just wanted to follow up in case someone else has a similar, easy to fix problem. It turned out to be pretty simple. I followed DG's tutorial on checking the GP's and found that #3 had too much resistance. #3 was around 11.5ohms and the rest were right around 1ohm.
I replaced the #3 plug and the light works again. It also seems to start a little quicker? But that could be my imagination. 
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AJ 1985 300D (SOLD)
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#8
10-20-2009, 03:18 PM
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Good job. Once you do glow plugs the first time, they become real easy to troubleshoot the next time around.
__________________
2009 ML320 Bluetec 1985 300CD 1981 300TD  Past Mercedes 1979 300TD 1982 300TD 2000 E320 4Matic Wagon 1998 E430 1984 300SD 1980 300SD
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