On usual morning commute, the glow plug light came on for about 2 minutes and then went off. A few minutes later the light came on again and stayed on for about 10 minutes and then went off and stayed off. While it was on, I jiggled the key with no effect. When I had parked, I ran the switch through the on-glow-start cycle several times with no problem.

The relay is about 6 months old -- a Behr. All wiring to the relay looks good. The key switch is a used one that I put in about 8 months ago. It seems to operate OK.

I do not know if the glow plugs were actually receiving power when the glow plug light was on.

Any thoughts will be appreciated.

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1984 300SD 326,997 miles and counting . . . No wait, my odometer is still dead

When mine did that a few years ago it was due to a bad relay.

There have been a few reports of this being associated with washing the engine. I guess water gets in the relay case somehow.

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Palangi

2004 C240 Wagon 203.261 Baby Benz
2008 ML320 CDI Highway Cruiser
2006 Toyota Prius, Saving the Planet @ 48 mpg
2000 F-150, Destroying the Planet @ 20 mpg



TRUMP .......... WHITEHOUSE
HILLARY .........JAILHOUSE
BERNIE .......... NUTHOUSE
0BAMA .......... OUTHOUSE

I believe that your Glow Plug Relay is about to go bad.

If your glow plug light stays on, you will end up with a dead battery.

When I went through this last year, I would plug in the Glow Plug Relay plug to start the car, and unplug it after I started it.

I called the process "The majic diesel ritual, known but to few". Good for a few laughs until I bought a new GPR and fixed it for good.

- Patrick

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1982 240D. 198k, Marine Blue/Blue, 4 Speed, Crank Windows, No Sunroof, No Rust, No Oil Leaks
2001 TDI. 197k, Lagoon Blue/Black, 5 speed, Chip, G60/VR6

I had this on the smoker last year, and it was a bad glow plug relay.

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Jimmy L.
'05 Acura TL 6MT
2001 ML430 My Spare

Gone:
'95 E300 188K "Batmobile" Texas Unfriendly Black
'85 300TD 235K "The Wagon" Texas Friendly White
'80 240D 154K "China" Scar engine installed
'81 300TD 240K "Smash"
'80 240D 230K "The Squash"
'81 240D 293K"Scar" Rear ended harder than Elton John

Ditto, bad relay.