glow plugs

1981 MERCEDES BENZ 300D
220 MILES • 5 CYL • 2WD • AUTOMATIC
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RICHARDC
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hello! my vehicle is a 1981 mercedes 300D. i have just replaced my glow plugs. i worry about the relay failing, my glow plugs staying on and having a shorter lifespan. i am considering opening the hood each start, and inserting the fuse [the breaker located directly over the LF wheel], starting the car normally, removing the fuse, closing the hood, and storing the fuse in my glove box until the next start. this sounds like a nuisance to me. is there a less cumbersome way i can be assured my glow plugs will be on ONLY when i want them on, and thereby have longer lifespan?
Mar 9, 2011 at 5:37 PM
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DOCFIXIT
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Suspect control unit temp resistor faulty see diagram. if operating will not allow plugs to have power over 25 sec.
Mar 9, 2011 at 5:47 PM
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CHRISLLOYD
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Most impressive answer by Docfixit, Here's another question, please.

I have a 1975 Mercedes 300D which has ignition and/or glowplug and/or relay issues. I assume (always dangerous) that this relay is a box of primitive electronics?

The only parts which I can see listed are M-B units at $350 or thereabouts. Is there a reputable supplier at more realistic pricing?

I guess that I should also ask whether one can test this relay? Other than by "it don't work so buy another"

Any other ideas would be supa-welcome.

Regards
Nov 3, 2012 at 12:12 PM
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