starter relay and glow plug relay - Diesel Forum -
Power Strokes 1994-1997 General Technical discussion of topics related to vehicles powered by the Power Stroke engine in 1994 through 1997 models.

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post #1 of 5 (permalink) Old 01-07-2009, 05:23 PM Thread Starter
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starter relay and glow plug relay

can you use a golw plug relay as a starter relay. im talking about the one of the fender?


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post #2 of 5 (permalink) Old 01-07-2009, 05:45 PM
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Originally Posted by rockets10510 View Post
can you use a golw plug relay as a starter relay. im talking about the one of the fender?

If I remember reading right, the relays are grounded differently. GPR is INTERNAL grounded and the starter relay is EXTERNAL grounded.. I suppose it could be done but probably not recommended..If I am wrong some one will be along shortly to correct me

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post #3 of 5 (permalink) Old 01-07-2009, 05:57 PM
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Even if you can wire it up the amp requirements and the time engaged for the glow plug relay differ enough from the starter relay that those who have tried starter relays in their place have experienced failure in short order.

Short answer, they are not interchangeable.

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post #4 of 5 (permalink) Old 01-07-2009, 05:59 PM
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A starter relay is grounded at the mounting bolts.
GP Relay is not grounded at the mount because the PCM grounds it on 1 small terminal when it calls for heat and then ungrounds it about 2 minutes later

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post #5 of 5 (permalink) Old 01-07-2009, 06:07 PM
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The starter relay has it's ground through the case, the glow plug relay is not grounded and has a switched ground through the PCM, so they are not the same. It would be possible to make a glowplug relay work for a starter relay. All you would have to do is ground one of the small terminals of the glowplug relay, however many times starter relays have a built in diode to suppress backspikes into the electrical system. The glow plug relay does not have a diode. You could add a diode. This is getting too much modification to be advisable I would say.

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