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#1
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Interesting problem: glow plug works, but dash light doesn't (with a good bulb)
The instrument cluster light for my glow plug indicator stopped working, but the problem is not the bulb (I've swapped a good bulb in and then verified it was still working after trying), or the glow plugs themselves - they work.
Anyone ever encountered this problem? Is there a typical loose connection? This is on the 85' 300SD with 152K. Thanks
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http://i284.photobucket.com/albums/l...aman/Fleet.jpg Peach Parts W124.128 User Group. 80 280SL 85 300SD 87 300TD 92 300D 2.5 Turbo 92 300TE 4Matic |
#2
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I had it on both my Benz's and swapping the controller isn't the answer. Honestly I forget what IS the answer because for the trouble of it I just ended up wiring the indicator light right to the glow plugs themselves.
Someone correct me if I'm wrong but there's a separate piece besides the GPC that "calculates" how long to glow based on how cold it is. This doesn't stop the actually glowing but rather how long the indicator light is on. Like a dummy manual for dummy lights. Hope that helps, Bill
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'87 300SDL, intensely modified Greasecar setup, with nickle plated heat exchanger, 3 valve setup, 312,000 miles '95 Suburban diesel, Greasecar basics, 16 plate heat exchanger, mercedes fuel lines, Racor filter '85 Renault Alliance converted full electric vehicle |
#3
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Quote:
No. |
#4
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Each and every one?
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#5
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That's the question.
If the lamp does not come on when you turn the key to position 2 but the lamp itself is good, you likely have at least one bad glow plug. This is how the relay informs you. |
#6
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Ah Ha! I'll have to trouble shoot all the plugs now to see if one is bad. Many thanks! BTW, how do I trouble shoot the plugs?
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http://i284.photobucket.com/albums/l...aman/Fleet.jpg Peach Parts W124.128 User Group. 80 280SL 85 300SD 87 300TD 92 300D 2.5 Turbo 92 300TE 4Matic |
#7
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If the glow plugs turn out OK, you may also want to check the traces on the circuit board that makes up the back side of the left hand panel of the instrument cluster. Mine had one burned out trace - the light was really dim until I fixed it by soldering a wire in place of the bad trace.
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1984 300TD |
#8
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Quote:
My light goes on for about 3 seconds. But I know the glow plugs are on as I can hear the CLUNK of the plug relay about 15 seconds or so later.
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NC Benz Fuquay-Varina, NC 1979 300D 1983 300D Turbo 260,000 Miles 1984 300D Turbo 345,000 Miles (sons car) OBK #31 1998 Ford Expedition 5.4l (fer Haulin'!) 145,000 1973 19' SeaRay with 115 Mercury TOWER OF POWER! Club Car Golf Cart 36V Ex toys: 1967 Mustang 289 (First Car) Fiat 124TC 1975 Honda CVCC 1980 Audi 5000 Turbo |
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