Ben;

If the generator spins as a motor, that's a good sign, but it may be still be doing this with an open field, just on residual magnetism in the iron of the case.

Because of the intricacies and complexity of the OE charging system, the best way to troubleshoot is by substitution with known good parts, and since you've already tried the VR, the genny is oviously next. Check under brush-inspection band when unit is out of vehicle...check for field coil continuity.

Hint: Try to locate the problem by sniffing around for the telltale burned smell...including at VR and fuseblock wiring.

Good Luck

Pearl; Thanks for the honorable mention!...and I'm glad to hear your satisfied with your upgrade. When Ben's ready to upgrade, I hope to hear from him, but I understand if he want's to give the OE system another chance...

Cheers