What do the 2 small wires do on GPR? - Ford Powerstroke Diesel Forum
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post #1 of 6 Old 10-26-2012, 07:37 PM Thread Starter
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What do the 2 small wires do on GPR?

Hey guys, I dont think my GPR is working right. I have 12 volts to one large lead on the GPR, 12 volts to one of the smaller leads on the GPR and no other voltage to the other large and small wire. Should the other small wire have 12 volts to cause the GPR to open and run voltage to the glowplugs?

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post #2 of 6 Old 10-26-2012, 08:50 PM
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Here is a great article that has pics and everything - should get you squared away!

Welcome to guzzle's Stancor GPR replacement Mod Web Page

And the other side would have voltage when the GP are supposed to be on, key forward.

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post #3 of 6 Old 10-27-2012, 04:44 AM
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To answer your question, the two sm wires are the "coil" in the relay that, when energized, provide the magnetic field that moves the contacts inside together to pass power through the two large terminals. How this is controlled is by the PCM providing a ground Path for that current to flow.

So, one of the sm wires is supposed to have 12v in it and the other goes to the PCM and will go to ground only when the GPs are supposed to be on. BUT, when connected to the relay, if you put a test light on either sm terminal you will see 12v there because the test light is providing that path to ground through the filament...
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post #4 of 6 Old 10-27-2012, 05:37 AM
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What do the 2 small wires do on GPR?-imageuploadedbyautoguide1351344985.779500.jpg found this on another forum (which will go unnamed for censorship reasons.)


And to hook up a GPR LED I would just put the power wire on terminal #4 and run it to the led and then to ground. Correct?

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post #5 of 6 Old 10-27-2012, 08:53 AM
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Well yes, but,,, you know you can't just put 12v into a regular LED - right? You need a resistor in-line with it so you don't fry it. Also, consider putting a fuse as it comes off that terminal. There's a Lot of current available there and an unprotected wire would "glow" if it were ever shorted
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post #6 of 6 Old 10-27-2012, 09:09 AM
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I know. I just didn't feel like typing all that. Haha

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