alternator wiring with HEI for 74 help ...

None of these harnesses are "Mopar friendly."

One of the alternator field terminals...........

and the VR IGN terminal should get switched 12V "in run" from the key

The remaining alternator field terminal goes (green) back to the VR F terminal.

The VR MUST be grounded

Simple diagram, from MyMopar:



I BELIEVE the generic harnesses pretty much have an "exitation" wire in them. Check it over, it probably is same as switched ignition

Many of us with generic harnesses have bypassed the resistor "right at the key." Hook the IGN1 and IGN2 terminals together at the switch. This is because the "run" (IGN1) goes dead in cranking.