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'66 custom Cab with alternator light (not ammeter). I bought a new harness alternator-to-voltage-regulator, It has two extra terminals vs what is in the truck at the moment (see photos).
My alternator presently doesn't have anything attached to GND post (I assume it grounds through the frame to the engine?).
I figured I'd just connect terminal "B" of the new harness to the GND post of the alternator.
But where is "A" supposed to connect? Is this used when the vehicle has a factory ammeter gauge (and has the terminal block on the inner fender, which mine doesn't have)?
I included the Volt regulator connector photo just for completeness.
I went through a similar situation with my 1966, 240. No matter what I did, the battery would not charge. (I had installed a new battery to regulator harness, alternator and regulator).
I did myself a favor, and suggest you do the same to avoid any more problems.
Buy a 1 wire alternator (I chose a 100 amp) install it, connect a good ground, install the positive cable to the battery and your problems are solved.
Yes, the black wires with the red stripes are grounds. In your drawing "B" to ALT GND terminal, "A" to engine block. There should also be a black/red at the regulator it attaches to the screw holding the regulator to the core support. The green/red out of the "I" terminal at the regulator is the exciter voltage from the light on the dash, there is also a resistor wire paired with the dash light so the ALT will get voltage even if the light burns out. Check the green/red before you plug it up with the switch on to make sure it has voltage on it. It won't be a full 12V because of resistance in the bulb but should be 8-10V. You don't need an ALT over 60 amps unless you have a sound system with a big amplifier.
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