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I finally had time to find my second voltmeter drawing. It is very important to install a fuse in the orange and positive lines going to the relay. This is not shown in the drawing. The fuse should be as close as possible to the source. Karl

Scottladdy. I agree with your statement. Very nice write up. The only thing I would change is; Relay Cycling (off/on) = performed by the glow plug module during the afterglow period to prevent an over voltage condition from occurring and burning out the glow plugs. Trigger voltage on the...

Eric, I apologize for not being clear. I was referring to the afterglow in my answer, not relay chatter or fast cycles. I should have specified this. It all depends on the voltage that the GP card monitor is seeing to determine afterglow cycle rate if its needed. Some vehicles may indeed have...

You have a good question. I have noticed the same situation with my three CUCV vehicles as well. Two have the resistor bypass and one was converted to 12 volts by the previous owner. When you modify the voltage source to the glow plugs (resistor bypass procedure) from the factory 24 volt...