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#1
06-30-2011, 04:16 PM
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Glow plugs will not turn OFF
Hello,
I have a 1976 w115 300D that i am trying to get into working shape to use as a dd. Right now i have to main issue preventing it from being a reliable dd. The glow plugs will not shut off, the wires in between the glow plugs will glow bright orange and even started to melt the ground wire on the last plug closest to the radiator. I unhook this ground wire to get them to stop glowing so it wont kill my battery or burn up the plugs. The other issue is the battery is not charging, the battery light stays on key off and key out. while it is running it get dimmer as rpm increases. I know the wrong belt must be on there because it is adjusted to the max and is still slack. 
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#3
07-01-2011, 02:01 PM
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Quote:
The glow plugs engage when the key is turned to the on postion. Another interesting symptom is that the glow plugs dont turn off even with the key off... The previous owner did/had a rewire of most of the engine harness. Thanks 
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#4
07-06-2011, 11:23 PM
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my '75 300D had the same issue with the GP control. It also smoked the voltage regulator when it happened. I disconnected the stock GP controller and installed a manually controlled GP circuit and replaced the reg. 3 years now and still working fine. Sure I have to push a button now, but the added glow time is nice in the winter time. Good luck with getting yours sorted out.
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H.D.B. OBK #45 ----------------------- '75 W115 240D, wife's dd, 197K ........'75 W115 300D, my dd, 245K .. .. ..........'82 W126 300SD, the 'someday' project
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#5
07-07-2011, 11:58 PM
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ive seen this before, i didnt feel like diagnosing it, all i did was install a switch from the gp relay, so essentially id press a button with the key on to pre heat the cylinders, start the car, then turn the switch off. are you restoring your car? or just driving it? it may be a pita to deal with a birdsnest of wiring from a p.o. if they didnt know what they were doing.
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95 E320 24k 07 E550 4matic 20k Soon to go 1977 240d 481k 2013 SL 600 Non MBs 02 Ford F250 Lariat 4 Quad Cab 7.3 Diesel 95k 01 Chevy Suburban 249K LT 5.3 V8 88 Saab SPG Convertible 32k 06 Lincoln Mark LT 59k 62 VW Bug 52 Bentley Mark IV 53 GMC half Ton Pickup 08 VW Beetle convertible 2k 07 bmw x5 4.8i 17k 03 bmw x5 4.4i 40k 08 Range Rover S 9K
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