Glow plug module help.

[fctry286]

So I adjusted my valves the other day and was hooking everything back up and I messed the + and- wire up on gpr box. Instantly drained the batteries and couldn't start the truck. Fixed the wires replaced the 175 amp fuse. And I am still getting the glow plug circuit a mal. The gp light comes on but the is slower cranking and the cel comes on. Oh I even swapped out the relays. Im lost.

 

[dmax711]

It could have messed the module up, can i ask why you were adjusting the valves?

 

[fctry286]

Just checking them. Its been a little bit since I put the heads on. And was a little noisey. How much are the mods.

 

[fctry286]

Could I just unhook it for right now?

 

[bluebowtie]

Gpcm is $165 from the stealer.


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[fctry286]

Damn. Better call the wrecking yard.

 

[bluebowtie]

Buy a new one. Bad gpcm is a common problem. Super easy to change tho.


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[Righteyeblind]

Just go to Napa and get relays to replace the ones inside of the module you have. That black top is just a lid. $10 instead on $150 and you have a remanufactured module.

Napa Echlin#AR282

Edit: This is for an LB7 not sure which one you have

 

[dmax711]

how cold does it get where you are? a friend of mine doesnt run glowplugs and hasnt had any problems during the summer.

 

[fctry286]

I put new relays in. Didn't help. Im in San Diego

 

[Righteyeblind]

You shouldnt need glow plugs then. As warm as it is down there. Probably have another issue. Glow plugs on LB7's are warrantied till 200000 miles too if that is the problem. Have you tested rail pressure while cranking?