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#1
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300sd light for glowplugs do not work
When I turn the key on my 300sd 1985. The light on the dash does not come on. My glowplugs are not working,I have not checked the fuse yet. Is there anything else I need to check? thanks
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#2
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Normally, when all plugs go out, it's the fuse.
If not, then the relay might have bit the dust. Usually one or the other. One is $1.00........the other is............ |
#3
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Where is the relay in the fuse box?
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#4
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Quote:
It's a black box on the driver's fenderwell, forward side. It will have a five pin connector in the side that leads to each of the glow plugs. |
#5
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I found the relay,it is 3 by 3 inches.Where is the fuses for the glow plugs.I looked in the fuse box but it did not list a fuse for glow plugs.
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#6
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check this out.
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#7
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Thanks------------
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#8
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This morming i turned the key and the light did not come on.I turned the key off and then back and the light came on. Had to preheat 2 times and light worked both times. Latter in the day the light did not work the first time--but the second time it did.Any ideas why it would work the second time?
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#9
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Quote:
Do a resistance test of each glow plug via the harness and confirm which one's are NG. |
#10
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I have a glowplug light issue too...
My GP light rarely ever comes on. Sometimes, it will come on after I have warmed the engine, turned it off, and then on again. Even then, it stays on for about five or so seconds.
Each one of my glowplugs has been tested and they are all showing < 1 amp. My GP relay also makes the click noise after about thirty seconds. I live in a warm climate (Southern California), and I've heard that the later diesels are "smarter" and that they minimize GP heat up time according to the temperature. Is this true?
__________________
1987 300D wvo on the way! |
#11
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Less than 1 amp or less than 1 ohm? Should read about 0.6 ohms cold on a good glowplug.
Len |
#12
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Oops, I meant ohm.
__________________
1987 300D wvo on the way! |
#13
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A better test of (parallel style) glow plug health is a current draw reading. But you need a DC ammeter capable of 20 amps to do this. Ohm readings are good but can miss a partially broken, poorly heating glow plug.
The real definitive test is to pull them all out and apply 12 volts to them (individually) and watch them glow red. I had one that was partially broken such that it would draw about half the normal current - it would not glow bright red. However, this is a dangerous test to the extent that you can severely burn yourself if you touch the hot glow plug to your skin or other internal and external organs. Only a professional should do this test, do not attempt to repeat this test at home. Etc. Etc. Ken300D
__________________
-------------------------- 1982 300D at 351K miles 1984 300SD at 217K miles 1987 300D at 370K miles |
#14
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That is what I am thinking.It starts harder than normal. Thay is a good way to check them-pull them out and turn the key and see what one turn red.
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