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Literally, there is no reason that replacing the plugs should not have resolved the problem..

Well, it may be that the newly installed glow plugs just needed a break-in period. I allowed the truck to sit for two hours, in 20 degrees, without plugging in the block heater; it started though I did not hear the relay cycle. I repeated the exercise again, after a ninety minute cold interval...

Hey, thanks Tinstar! There seems to be a number of folks that advocate a bypass operation with a button installation... What are your thoughts?

Thank you.

I do have a multimeter. I downloaded the TMs. Does the 1009 have a glow plug controller card? On an unrelated note, does it damage the vehicle to drive with the lockout hubs engaged, when not in 4 wheel drive?

I was an 11B until I was an NCO. By the time I was in a unit with vehicles/motor pool, I didn't always make it to motor stables, like I should. Now I'm paying for my lack of vision...

Yes, at one point the system worked fine. my -20TM is on the computer that died..

I did replace the glow plugs, this morning but they're not cycling. I don't know how to test the controller card, or the glow plug relay...

I just replaced the glow plugs and they don't cycle. How do I proceed?