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  #1  
Old 06-09-2006, 02:02 AM
Patriotic Scoundrel
 
Join Date: Jul 2004
Location: Ridgecrest, CA
Posts: 1,610
Glow plug bypass - tell me why this won't work

On the old torn up 300D I think I have some glow plug relay issues or other possible electric gremlins. The previous owners have not been gentle with this car and the wiring harnesses are cut in several places. Car runs rough, mostly I think due to no glow function. But, I'm not really complaining it was only $400.

What I want to do is go with the pencil plugs on the '78 300D and basically hook up a switched line direct from positive on battery to glow plugs. I'll re-wire them to run parallel rather than series and let them ground out on the block. If I wire it such and turn the switch for 10-20 seconds or so I should get glow in the cylinders. Right?

So tell me, why won't this or why it's a really bad idea?
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Old 06-09-2006, 02:12 AM
stcbenz83's Avatar
Mercedes Euro 240D
 
Join Date: Mar 2006
Location: Louisville, KY
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well say it does work, what about after the car is started? ur just gonna let the GPs keep running?
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  #3  
Old 06-09-2006, 02:14 AM
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nope, once started I'll turn the switch off. Essentially I become the timer relay without the accompanying flow of electricity (I hope).
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  #4  
Old 06-09-2006, 02:41 AM
ForcedInduction
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If you go with the pencil type, they are self grounding. All you need is the + side. A relay is a must, they have 80A of current flowing through the circut.

See THIS post on how I control mine.
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  #5  
Old 06-09-2006, 07:49 AM
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Join Date: Nov 2004
Location: Nova Scotia, Canada.
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Sure it will work. I would use a older style ford starter solenoid and a pushbutton myself. The starter solenoid can easily handle the 80 amps and the push button you will never leave on accidentally.
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  #6  
Old 06-09-2006, 11:29 AM
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Location: Loganville/Atlanta
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Instead of all that why dont you just do this

http://dieselgiant.com/mercedesdieselloopglowplugrepair.htm
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  #7  
Old 06-09-2006, 02:25 PM
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Quote:
Originally Posted by barry123400
Sure it will work. I would use a older style ford starter solenoid and a pushbutton myself. The starter solenoid can easily handle the 80 amps and the push button you will never leave on accidentally.
Thats just what I did several years ago on my 79. The push button switch (15 amp) is located under the dash (just above the left knee) so I can glow and turn the key at the same time . Its wired through the GP light on the dash. Works great
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