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[quote=mr.precision;8751497]Thank you for the detailed information.
The brown wire coming off the ignition switch was, indeed, disconnected. The odd thing is that it was connected to the two green wires at the base of the ignition switch plug. According the wiring diagram, that is for the temp idiot light. I don't have an idiot light for temp indicator.
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This was probably done by a previous owner. He may have changed the dash cluster to gauges from the light cluster. Connectiong the brown wire to the greens would make a path to ground through the sending unit, except that the resistance of the sending unit would prevent a direct short and burning of the wires.There should be two brown wires on the key switch for the brake warning light that check it when the key switch is placed in start. The key switch grounds them to turn on the light when the key is placed in start.
I checked continuity for this brown wire at both ends, disconnected from the regulator. All good. I also installed a new ignition switch plug as the old one was in really bad shape.
Years of having all the trucks current running through this connector will do that, it is very common and is the reason newer cars and truck use the ignition switch to turn on relays for the electrical circuits
Concern now is that the
regulator connection for the brown resistance wire is showing a chassis ground. Not the wire itself....just the terminal at the regulator.
You are probably reading through the points wiring to ground, are you showing a small resistance?
If that terminal is grounded, does this indicate the regulator is bad? Perhaps manually closing the points with this wire hooked up fried something in the regulator.
No- See above