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#1
04-27-2012, 09:37 PM
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Glow plug light flickers on while driving
The 300D has done this off and on every once in a while, but it never really raised any immediate alarms. While I'm driving, every so often the glow plug light flickers for a bit. It does it very sparingly and I'm not sure if it's due to a bad connection somewhere, but I can't seem to pinpoint weather conditions when it's occurred the most.
I don't think it's an emergency by any stretch, but I'm wondering if anyone else has encountered this before and if so, any insight on how to fix it?
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Never be ashamed to ask for help. 1985 300D 1987 300SDL 1970 Jaguar E-Type OTS 2002 Dodge Intrepid (Traded In) 2011 Ford Crown Victoria 
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#2
04-28-2012, 12:43 AM
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Happened to me a few years ago in my 84SD. I replaces the glow plug relay and it solved the problem. My determination was that the relay was bad and would open/turn on randomly. Perhaps I could have investigated the bad relay first to see if I could fix it.
I believe I have a thread on my experience if you want to search my name.
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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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#3
04-28-2012, 08:34 AM
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I will do that. Thanks!
__________________
Never be ashamed to ask for help. 1985 300D 1987 300SDL 1970 Jaguar E-Type OTS 2002 Dodge Intrepid (Traded In) 2011 Ford Crown Victoria
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#4
04-28-2012, 09:31 AM
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Okay, I searched but my thread was more about my alternator being bad than the glow relay being bad although I did mention it.
I had forgotten that I hypothesized that my GP relay coming on randomly took out my alternator. I also found other people with the same problem (GP light flickers). I would suggest you either replace the GP relay or troubleshoot the relay. One thing to do would be start the car, THEN disconnect the power lead to the relay and see if the flickering persists. If so then the issue is probably not GP relay related.
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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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#5
04-28-2012, 09:42 AM
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I may just change it out. Chances are it's probably the relay due to its age. Is it easy to do?
__________________
Never be ashamed to ask for help. 1985 300D 1987 300SDL 1970 Jaguar E-Type OTS 2002 Dodge Intrepid (Traded In) 2011 Ford Crown Victoria
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#6
04-28-2012, 09:58 AM
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yeah, just disconnect the battery first, as the hot lead feeding the relay is hot ALL the time. two sockets to unplug, one wire to unbolt, and two mounting screws to remove.
__________________
John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread "as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do! My drivers: 1987 190D 2.5Turbo 1987 190D 2.5Turbo 1987 190D 2.5-5SPEED!!!  1987 300TD 1987 300TD 1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!
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#7
04-28-2012, 10:03 AM
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Glow plug relay is getting wonky on you. I (and several others) have had the exact same issue, and a new relay solved the problem
__________________
2012 Mercedes ML350 Bluetec 91K (hers) 2005 Corvette 55K (fun car) 2002 VW Jetta TDI 231K (mine) 1998 Volvo S70 T5 Turbo 196K (kids) 1994 Ford F150 4WD 249K (firewood hauler) 1983 Mercedes 300D 376K (diesel commuter)
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