Two GPRs?
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Rocky Mountain High
Joined: Nov 2007
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From: Parker, CO
Two GPRs?
I am trying to rule out the GPR for my starting issue and have noticed that my 2002 7.3L has two GPRs (one is shorter and behind the other). Am I seeing things? Are they both GPRs or what? Which one should I be testing and or replacing to rule out hard starting? Thanks!
Hotshot
Joined: Jul 2008
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From: N.GA Mountains
The relay in front is for the AIH. 
Do test the GPR for power to the GP's at cold start. Next would be to ohm out the GP's at the VC harness and verify they are all good. The outer (4) pins are GP's...
Do test the GPR for power to the GP's at cold start. Next would be to ohm out the GP's at the VC harness and verify they are all good. The outer (4) pins are GP's...
Senior User
Joined: Aug 2011
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No you dont have 2 GPR's the one in the front is the relay for the AIH the one behind it is your GPR.
Post Fiend
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Laughing Gas
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From: Palatka, FL
I think he meant Quick Draw SkySki lol.
Turn your key to run which will turn on your GPR. The LARGE lead on the passenger side should always be 12 volts(hot). The large lead on the driver's side you want to have 12 volts on it after you turn the key on.
Turn your meter to DC voltage. Place Red lead on the Large Drivers side terminal and the black lead on a good ground or the battery negative post.
Do you have 12 volts present?
This will just show you if you have voltage present and it can not tell you if you have current flow to each glow plug.
I hope I have not taken you to grade school on the use of the meter. I just want you to know exactly how to check your relay when you turn your key to on/run.
Dwayne
Turn your key to run which will turn on your GPR. The LARGE lead on the passenger side should always be 12 volts(hot). The large lead on the driver's side you want to have 12 volts on it after you turn the key on.
Turn your meter to DC voltage. Place Red lead on the Large Drivers side terminal and the black lead on a good ground or the battery negative post.
Do you have 12 volts present?
This will just show you if you have voltage present and it can not tell you if you have current flow to each glow plug.
I hope I have not taken you to grade school on the use of the meter. I just want you to know exactly how to check your relay when you turn your key to on/run.
Dwayne
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Rocky Mountain High
Joined: Nov 2007
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From: Parker, CO
Thanks Dwayne! Got the basics on voltage but do you have the proper technique for measuring the resistance? I know it should be low (1.5 or so and not 800). What posts do I check for that?
Hotshot
Joined: Jul 2008
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From: N.GA Mountains
Next would be to ohm out the GP's at the VC harness and verify they are all good. The outer (4) pins are GP's... 
I'll see if I can find a pic or pin-out diagram, but its pretty easy - the center pin on VC harness is 'common' for the injectors, the next 2 in each direction are for injectors and the outer 4 pins are for GP's and are relative to their location. Clear as mud?
Like this G G I I C I I G G...
Hotshot
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From: N.GA Mountains
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