OK great. Start by disconnecting green field wire at alternator and "rig" an alligator clip lead to the alternator terminal, and direct over to the battery. Start and run and monitor battery voltage. Voltage should come up but don't allow above 16V or so. If that works, it is in the field wiring or VR
If voltage stays low, monitor the output stud right at the alternator to make sure there is no break in the charge path to battery. If no change (voltage low, near 12V) you have trouble in the alternator
