Please help.....glow plug issue big time - Ford Powerstroke Diesel Forum
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Old 01-08-2013, 04:07 PM
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Please help.....glow plug issue big time

Ok so i am on the verge of driving the truck off a cliff.

I just exchange my new gpr for another new one in hopes it was just a bad one. Installed and still the same thing, when key is on the glow plug side is not getting power. Any recommendations?

Hopefully this doesnt add confusion. When you drive it with the glow plug attached it cause the od light to flash and go into limp mode.

Hopefully someone can help me. Thanks
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Old 01-08-2013, 09:40 PM
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is the control side getting power with the key on? that is, the signal. small wire. you should have power at both small wires with the key on, since the pcm supplies the ground for signal
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Old 01-11-2013, 06:06 AM
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one of the large wires on the gpr is a hot wire from the battery if you have no voltage its time to trace the broken or disconnected wire
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Old 01-11-2013, 01:44 PM
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I have power to the power side and also to the two small wires when key is on. when key is off both small wires have no power. the glow plug post does not get any power when key is on.

if it was a disconnected wire some where would that really cause the truck to go into limp mode?

I have to disconnect the 2 small wires in order to drive becuase with them connected it goes into limp mode. I can leave the 2 big posts connected and it drives fine its just those two small wires that seem to cause it.

Any ideas?
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Old 01-11-2013, 10:41 PM
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you most likely are correct with the fact that it would not cause a limp home mode issue but when you said you had no power that was the first big issue i saw now on the two small wires you say they both have power this is an issue one of them should be a ground if they have power one of them might possibly belong somewhere else and you are missing the ground wire completely it will be the completion of the circuit through the two small pins that will close the circuit of the two large pins now if you have a multimeter check to see if one of the pins is grounded with the key on it is an ecm provided ground so if you have no ground its because the ecm is not commanding it on if this is the case their is another sensor or system that is your issue and i would look at getting your codes read and see where they point you it could just be a faulty temp sensor or just mis matched wires somewhere if you did not have this problem before try removing the small wires and testing them for power or ground off the relay it will be a better way of testing them isolating them from the system again hope this helps and let us know what you find
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