Solenoid coil wiring - Ford Powerstroke Diesel Forum
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Old 12-02-2010, 08:42 AM
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Solenoid coil wiring

Does anyone have the wiring diagram of the GPR. What I am looking to know is how the red and pink/white wires are controlled. These two wires are the activation coil of the GPR.
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Old 12-05-2010, 08:53 AM
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So this has been posted for several day and no one knows what controls the coil of the GPR? I would think that someone on here would know what operates the coil to engage! Do these coils come on all the time when the key is turned on or are they also controlled but outside/engine block temperature? I see NCHornet posted a good post on testing and changing to a higher current contact solenoid but never states what actually operates these solenoids. After looking a a schematic it appears the the power is feed from pin 24 of the 42 pin connector. and the the ground to operate the solenoid is from pin 41 of this same connector.

Now I am assuming that these pins are controlled by the vehicle ECM. Can anyone tell me if this is true? Also does anyone know if they are also only activated at certain temperatures?

TIA
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Old 12-05-2010, 09:38 AM
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The gpr has 1 wire that is hot with the key on and the other goes to the ecm and is grounded by the ecm to complete the coil circuit of the gpr thereby activating it and closing the high ampersge wires to the glow plugs. The key on wire is in front and the ecm wire is to the rear / firewall side. Note when testing you will see that with the key on most of the time both control wires will be hot unless you catch the engine temp cold and the ecm is grounding the circuit to activate the relay. Thats because the ecm control wire is open unless grounded by the ecm due to glow plug on inputs from sensors to the ecm. Because it is open and it is just a continuation of the coil wire in the gpr it will be hot until the ecm grounds it to complete the control circuit and activate the relay. When testing be sure to unhook the ecm wire before grounding that terminal or you could damage the ecm.
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