65 Dart Alternator Not Charging

OI

If you are running the old style, 69/ earlier VR, you must have one brush grounded. To test the alternator, jumper 12V to the insulated field terminal, and bringing up RPM while monitoring battery V, V should climb and keep on going. Slow it down or stop if it gets above 16V

If not, transfer meter to alternator output stud and measure there. If the voltage stays low, below 12. something at battery, it's not charging

If it DOES charge, be sure the field wire from the alternator to the VR is good, be absolutely sure the VR is grounded, and that it is actually getting 12V from the system when running.

If all those are true, bad VR

Might be time to do a field current test, field might be shorted/ partially shorted. Read the book, if it's not in that old book, download the 72 Plymouth service manual from MyMopar.com. Section 8