Just noticed something ELSE. That alternator should have TWO "tabs" one for each brush. Did you remove one brush? I cannot possibly operate with only one
On a side note, if you read my ramblings above, that alternator is for a LATER car which is fine. But to use your present VR you must ground one brush and connect the green wire to the other
The "different" later VR for 70/ later has TWO insulated brushes, and switched 12V goes to one of them, the green feeding back to the VR with the other tab
