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Glow plugs are 12v from the factory... and they are still 12v. CUCVs never came with 24v glow plugs. The resister took the 24v input and stepped the voltage down to 12v (assuming all GPs are working). When you do the resister bypass, you wire the GP solenoid to a 12v source.

I had the same thing happen to my M1028. Very rapid GP relay cycling on and off (like a machine gun). It is random on my truck. I usually pull the GP Controller card from under the dash and clean the contacts and that seems to fix it. Could be a coincidence but that is what I did. Maybe we...