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Well I did it. Not the right way but it's fixed: Found a few more random chopped wires sticking out of the fuse box. This truck used to be a police vehicle maintained by an idiot so you can imagine the hackjob under the dash. Probed some more with the multimeter, found the 12v source wire...

Started instantly at 0*F the other day after jumping the relay. Will check those grounds and the resistances off the temp sender. Tracking it's supposed to be about 300 ohms at 125* and ~30,000 ohms below freezing. Sent from my Pixel 7 Pro using Tapatalk

I think I understand now after finding some other posts: 24v is normal unless the glow plugs are glowing. Next question: Purple wire in the diagram - is it supposed to be 12v or 24v with the key on? Lastly: is there a method of troubleshooting the glow plug card? Mine is the new one from Mr...

Seems my resistor failed. 25.98 volts at the glow plug relay. Probably toasted a few plugs too. Sad panda if the card is toast, it's a new one just over a year old. Sent from my Pixel 7 Pro using Tapatalk