Single Wire Alt setup to 65 Barracuda Harness

No you must be right, I glanced at the alt while the motor was in the bed of my truck and I didn't see any other wires hooked up other than the heavy charge wire+.

So when I hook the Alt up after install it just hooks up and the stock one would? do I have to remove the external regulator or keep it in as well?

again thanks for you info and or comments