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RichardJ · 05-10-2017, 11:06 AM

Reconnect battery. If it starts to warm back up, remove R-F plug from alternator. If it cools down, there is probably a shorted Diode inside the alternator.
Check voltage on the F-2-3-4 wires on the regulator plug. Only pin #3 should have 12 volts with key OFF. Check by back-probing the wires that go into the plug.

05-10-2017, 11:06 AM	#3
RichardJ Registered User Join Date: Apr 2010 Location: So Cal Posts: 1,413	Re: Voltage Regulator Reconnect battery. If it starts to warm back up, remove R-F plug from alternator. If it cools down, there is probably a shorted Diode inside the alternator. Check voltage on the F-2-3-4 wires on the regulator plug. Only pin #3 should have 12 volts with key OFF. Check by back-probing the wires that go into the plug. __________________ '67 GMC 2500, 292, 4spd, AC