GPR LED QUESTION ?????
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Senior User
Joined: Aug 2009
Posts: 343
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From: lake havasu city az
GPR LED QUESTION ?????
gpr only comes on after i fire the motor. isent it suposto come when the key is in the on postion ??? when i first instaled it last wenter could have swarn it came on with key in on.
truck starts fine in the morning just cant rember thanks for the help.
truck starts fine in the morning just cant rember thanks for the help.
Laughing Gas
Joined: Jan 2007
Posts: 870
Likes: 9
From: Carbondale, CO
Only one side of the relay is hot from the battery all the time. When you turm the key, the relay should close and the other side becomes hot to the glow plugs. This is the side I tied my GPR LED to.
Laughing Gas
Joined: Jan 2007
Posts: 870
Likes: 9
From: Carbondale, CO
Yes, you should get voltage to the second large terminal of the GPR when key on. I do not know why you only get voltage after motor fires. I do know the PCM sends a ground to one of the small terminals on the coil for the GPR. Oil temp, outside air temp, a number of things are factored into the PCM sending the ground.
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Lead Driver
Joined: Jan 2007
Posts: 6,708
Likes: 5
From: Kiowa CO
Yes, the GPR gets power to the plugs when you turn your key to the on position. Double check the GPR with a test light to see if your LED is corresponding to the lug on the relay.
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Thread Starter
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Senior User
Joined: Aug 2009
Posts: 343
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From: lake havasu city az
gpr
i will have to check it with a test light when i get home from work. if the test light corresponds with led could it be a bad relay, or is it a pcm ground issue sooo confused. thanks for the help.
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