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The older alt with field sense you would leave it connected. If it was a newer style and the rear connection was marked ac then nothing should be connected there.

I would run a new one

You need 24v at the front terminal on the regulator to excite the alternator. There is an excitation relay in the panel. It is possible that someone switched the front and back leads. The rear terminal should be a field sense on the older alternators but it’s an ac voltage output on the newer...

No. Only disconnect the front regulator lead and take a voltage measurement on that wire with the engine running. Do not disconnect anything else. You should check all of your battery terminals and alternator connections make sure they are on tight.

With the engine running, take a measurement of the front terminal on the regulator wire. It has to be disconnected from the regulator to take the measurement.

Cab power goes thru the reverse polarity box. Its basically a diode array. You get 1/3 to 1/2 volt drop thru it. So the cab voltage will be slightly lower than the alternator output. But I would check all cables and connections. I would replace the dash power relay. I would make sure your...