Hi
My 1988 300d has become difficult to start and the glow plug light does not illuminate. I have found a large fuse near the glowplug control unit which is intact. What should I check next. Is there a seperate relay?
Many thanks
David Wells

We should get all of us with glo plug lighting problems together for a party. I have two of my three MB's struggling with that right now. Having checked the fuse, you might look at the other two threads (current) and go in order.

I believe the next things on your list would include:

Instrument bulb (if the car is starting properly)
Glo plugs (if the car is not starting properly)

Don

__________________
DAILY DRIVERS:
'84 300DT 298k (Aubrey's)
'99.5 Jetta TDI IV 251k (Julie's)
'97 Jetta TDI 127k (Amber's)
'97 Jetta TDI 186k (Matt's)
'96 Passat TDI 237k (Don's
'84 300D 211k Mint (Arne- Undergoing Greasecar Conversion)

SOLD:
'82 240D 229k (Matt's - Converted-300DT w/ 4 speed

This is something that has happened overnight. The glow plugs all give the same reading and get hot if connected to a twelve volt supply. They are all in first class condition.

Not sure about the 1988's, but my 1984 took a GP relay last year when it stopped glowing reliably. It did give a good bit of warning, not glowing intermittently for several weeks (or was it me procrastinating and being lucky that the car started in 50 deg F weather?).

My mechanic said something about an ambient air temperature sensor in the GP relay, couldn't find anything wrong in the two days he had the car, but sold me a used GP relay for $30; no problems glowing since.

__________________
Bob Roe
Lehigh Valley PA USA
1973 Olds 88, 1972 MB 280SE, 1978 Datsun 280Z, 1971 Ford T-Bird, 1972 Olds 88, 1983 Nissan Sentra, 1985 Sentra, 1973 230.6, 1990 Acura Integra, 1991 Volvo 940GLE wagon, 1983 300SD, 1984 300SD, 1995 Subaru Legacy L wagon, 2002 Mountaineer, 1991 300TE wagon, 2008 Murano, 2007 R320CDI 4Matic 52K, some Hyundai, 2008 BMW 535xi wagon, all gone... currently
2007 Honda Odyssey Touring, 2014 E350 4matic