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Old 09-12-2013, 08:48 PM
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CA Glow Plug Controler

Hello,

My name is Joe and I am new to the forum. I have a 2003 F350 7.3L. It is taking a lot of cranks to fire and I am concerned it is the glow plug controller. I have checked the resistance on the plugs and they check out. I have a CA truck and there seems to be only one relay and it is connected to the heater for the intake. The other thing is a small computer or glow plug controller on the passenger side valve cover.

From what I have been reading the CA trucks only have the control module for smog reasons and not a second relay. Can anyone clarify this for me? The second question is how can I verify that it is working.

Any help would be greatly appreciate any help.

Joe
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Old 09-13-2013, 06:14 AM
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determining if its working, i dont know, yet. But, the silver moduile, on the p/s vc, is the gp control module which controls both gp's...the other "relay' is the AIH one. Any non-CA truck, will have 2-aih relay looking solenoids, one for aih, other for gp's.

There is a 9-prong element, i've seen out there, hooked up to the gp module, then, fed into cab, registering 9-led lights, to signify if EACH gp is getting charged...
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Old 09-13-2013, 08:14 AM
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The other thing to check is the UVC harnesses on both sides. My bet is you have a problem there and not the Module. Those modules are very robust, we don't see many back here in NC, but I have spoken to tech's out West and they very seldom ever have to replace one. I know you have ohm'd them but wiggle the connector around and re ohm the plugs through the harness and see if they are still reading correctly. Last I heard that module was around $400, I would opt for one out of a junkyard or swap it with one from a friends truck before I would buy a new one.
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Old 09-13-2013, 08:36 AM
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If you have one of these:


Then you have a relay AND the GPM. I replaced mine a couple of years ago because it kept tripping the CEL with a code. Mine is a CA truck.

Last edited by SuperCrutyPS; 09-13-2013 at 08:40 AM.
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Old 09-13-2013, 02:54 PM
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Thanks guys. The help is greatly appreciated.
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