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UPDATE: So i received my new replacement GP module (card) today. Popped it in and turned the key...green light, amber light and red light! We now have a fully functioning as original GP system in the truck. Super Happy! Thanks to John at Hillbilly Wizard....great customer service and super-fast...

UPDATE: I contacted Hillbilly Wizard regarding the GP card. They said to send it back and they would test it and replace if needed. I heard back from them yesterday and they said the card was not working properly and a new one was sent out. I will update again once it arrives.

Sorry about the delay, I had to drive to Oregon to pick my son up from Winter Encampment. While I was gone, my stepson went through all of the tests in the TM. All of the wiring checked out. The solenoid and temp sensor were replaced, all tests indicate the GP card is the issue (which was new)...

So we just got done checking continuity to all of the glow plug wires (Including the temp sensor) and all are good. we just pulled the temp sensor out and will be checking it to (and probably replacing it as they have one at the auto parts store, we are heading to for some maintenance items for...

Marcus, I will check all of the continuity checks you listed in the morning when I can see. This has been such a pain in my A-- that i ready your reply and went and checked for the 6 prong grounding post. There is nothing attached to any of the 6 prongs, only the one wire that is attached to...

Marcus, I checked that this morning. There is no continuity of the 4 terminals of the ST85 to the attachment plate of the ST85. I just pulled an ugly mess of glow plug wiring harness that one of the PO's put in (for which we can't figure out why as the factory harness was still intact and just...

As I sit and pile through information and previous threads.......the ST85 is all metal. Does that mean it is grounding to the body? What have others done to remedy this since this appears to be commonly used replacement for CUCV's?

I am writing this after dark and will add pictures tomorrow but hoping for some insight/help in the meantime. I decided to replace the glo plug solenoid (old black plastic one) as a precautionary measure as it had not failed yet. I purchased the Napa ST85 and within a few minutes had it changed...