the blue wire ign1 (run) circuit T's & goes to one of the alt field terminals and to the top nub on the reg. I'd take all field wires off & jump 12V from batt positive post to alt and reg blue field wire terminals. connect green wire alt field terminal to side reg terminal. jumper alt and reg case and eng block to batt neg post. run it at a fast idle & see what the voltage is. this takes ALL wiring out of the picture & confirms the hard components are good or not (ex for a possible loose connection in the alt) but we gotta make some progress pinning this down