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ray_mcavoy · 03-26-2014, 05:40 PM

That black wire is part of the factory ammeter ("BATT" gauge) wiring. It should go to the large BAT stud on the starter solenoid.

If you look up the wiring diagrams in the FSM, they don't show the optional factory gauge wiring for the 10-30 series trucks. You have to refer to the diagrams for the larger medium/heavy duty trucks instead.

GM put 4 amp inline fuses in the ammeter wiring on the later year 67-72 trucks. I highly recommend adding them to the 64-66 ammeter wiring. They'll save the ammeter and it's wiring from burning up if a poor connection develops on one end of the shunt wire and forces too much current to go through the ammeter itself.

03-26-2014, 05:40 PM	#7
ray_mcavoy Registered User Join Date: Nov 2009 Location: Sherman, ME Posts: 2,379	Re: The joys of wiring....1965 c10 harness blues That black wire is part of the factory ammeter ("BATT" gauge) wiring. It should go to the large BAT stud on the starter solenoid. If you look up the wiring diagrams in the FSM, they don't show the optional factory gauge wiring for the 10-30 series trucks. You have to refer to the diagrams for the larger medium/heavy duty trucks instead. GM put 4 amp inline fuses in the ammeter wiring on the later year 67-72 trucks. I highly recommend adding them to the 64-66 ammeter wiring. They'll save the ammeter and it's wiring from burning up if a poor connection develops on one end of the shunt wire and forces too much current to go through the ammeter itself.