Iv been busy working on other projects, but finally found time to work on my junk. Is there anything in the tune that would turn off the alternator? Sounds stupid I know, but I can't seem to find anything else. All my wiring is 2 years old, and everything is working as it should. I have multiple ground wires that are all new and everything has been checked. The original alternator makes 6.6 volts, the new alternator makes 6.8 volts, the 3 other alternators I tried all are in that range. All the fuses have been pulled and checked for continuity, battery sits at 12.5 volts. Iv at a complete loss, this makes no sense at all. The only other thing I can think of is a bad resistor in the wiring harness, but it's a BP automotive $800 harness that's 2 years old.

What am I missing? I feel like an idiot, charging should be super easy.