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Old 12-11-2001, 04:51 PM
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Unhappy Glow plugs

Can anyone help me with the glow plugs on my 300D? The "wait to start" light will not come on. I guess they dont work because the car is hard to start when it is cold.
Is there a relay? Where is it located? Can it be repaired, or do I need a new one? Can I do an easy test on the system?

Thanks for the quick reply!! This site is awesome!
My car is a 1981 model 300D. It has 146,000 miles on it.

can you give me a little more detail on this test process?
Should I use a 12 volt test light?
Thanks again, Steve

Last edited by S.K.WEITZ; 12-11-2001 at 07:54 PM.
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Old 12-11-2001, 05:05 PM
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Join Date: Jan 2001
Location: Santa Clara, CA
Posts: 414
What year is your car? Assuming that it is one of the older versions, make up a short jumper out of #12 wire with alligator clips on the end and jump each of the terminals, in turn, of the glow plugs on the engine block until the light comes on. When the light comes on, the jumped glow plug is the bad one and must be replaced, although it can be argued that it is smart to do all of them at the same time.
Keep the jumper with you to get you going if one fails again.
'76 240D-Sold
'78 240D-Sold
'85 300 SD, 165K-Sold
'88 300 TE, 165K-Sold
'64 Porsche 356C Cabriolet
'86 560SL 124K Miles
'94 320E Wagon, 74K Miles
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Old 12-11-2001, 05:42 PM
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Ron's advice is good if you have a serial glow plug model. We MUST know what model you have to give you accurate information.

Have a great day,
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Old 12-11-2001, 11:01 PM
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Join Date: Aug 2001
Location: Atlanta, GA
Posts: 5,514
After you start the car, does the glow plug light blink? If so, that is the car telling you that one or more glow plugs are bad. And the previous posts are correct, glow plugs are inexpensive, so if you're replacing one, I'd go ahead and do all of them to insure easy starting. If your car has paralell-wired plugs, Larry's right--the jumper test won't work on those. You could also have a blown fuse on your relay, so check that too. The relay should be bolted to the fender well, or the firewall, depending on the model...just follow the wires from the glow plugs. The first thing you come to will be the relay.

1979 300 SD
350,000 miles
1982 300D-gone---sold to a buddy
1985 300TD
270,000 miles
1994 E320
not my favorite, but the wife wanted it

Last edited by mikemover; 12-11-2001 at 11:15 PM.
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