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Can anyone tell me if there is a way to test the individual glow plug output circuits at the module on the 6.0? I have new glow plugs as well as new left and right side harnesses that all test good. The main harness also tests good between the module and the new L & R harnesses. I hate being a parts changer without knowing for sure that module is bad.
If everything is new from the module to the plugs then I would check the positive wire off the pass battery to the module for power and then the only thing left would be the module its self imo...
I would think that if you turn koeo you will get power to each of the pins feeding your glow plugs. Then the module will shut off after cylinders get to 60 70 ° .
Check the pin on the one you have codes on versus one you don't. See what happens.
I had a #1 plug that would show a code and after putting a new one in and checking the harness
was still getting a DTC telling me it was bad. Dropped in a known good GPCM the problem went
away and never came back.