Alternator swap driving me nuts!

Thanks for jumping in RedFish. So if the field terminals measure no resistance to ground, that means I should only be connecting the one green field wire, right? But it won't charge. Shoudl I go back to the old style regulator? I bench tested it and it works as expected. I tried unplugging the field wire and jumping the terminal to ground to force the alternator to charge and I get nothing. I'm basing this off measuring voltage at the battery and the alternator post. They both give about 12V with no change when I ground the field terminal. I see bunches of videos saying this the way to test the alternator in the car but is that wrong for the older 1 field wire configuration?