94 -250 glow plug relay wiring color codes - Diesel Forum - TheDieselStop.com
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7.3L IDI Diesels (Not Power Strokes) Technical discussion of topics related to vehicles powered by the 7.3 Liter In-Direct Injection Navistar engines.

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Old 03-10-2010, 02:53 PM   #1 (permalink)
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94 -250 glow plug relay wiring color codes

I have put on as new relay and have the wires all mixed up and cant find a wiring diagram for my colors of wire. WHite with a large terminal end , a small red wire, yellow wire, a double green and red set , a total of 4 wires that I asume all go on small posts?? I need Help new to site and seems like lots of help here. Thanks in advance, were does the ground wire hookup too? All of the wiring diagrams dont have my color combination? Was able to jump start it last night and now the glow plug start light on dash wont come on now?

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Old 03-10-2010, 04:02 PM   #2 (permalink)
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Is this what you need? Ground is attached to one of the valve cover hold down bolts on mine (turbo model) and my controller is on top of the P/S valve cover. If the ground is different then someone will chime in soon enough.
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Old 03-10-2010, 04:38 PM   #3 (permalink)
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We've all passed that picture around alot, I wonder where it came from, seems like I saw it on FTE one day too.

That green wire is actually terminating under the metal strip at the top right of the picture. The yellow is terminating under the metal strip at the solenoid end.

I'm not sure if that white wire drawn in is quite right or not, you can see there is a white wire from that same post that goes to the controller, that one is correct but maybe there are two.

One thing to watch is that sometimes the white wire and the yellow wire can be easy to mistake since the white one might look a little yellow. I think that the one that is supposed to be white will have continuity to the ground wire until the controller turns off the GPs.

The ground just needs to be grounded good to the block.
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Old 03-11-2010, 10:42 PM   #4 (permalink)
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controller must be bad

Only way to get truck started is to ground out the terminal on relay. So I ill have to hook up a push botton on dash to make it run???????
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Old 03-11-2010, 11:40 PM   #5 (permalink)
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That can work too, just run a wire from where the white wire is attached to a switch in the truck and then to ground.
Just be carefull not to hold it on too long, in your case you will still have the wavy metal band resistor, so 8-15 seconds for a cold engine depending on how cold it is outside. Less if the engine is still warm.
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