I swapped in the MP restoration VR this weekend. On 1800 rpm fast idle, I'm getting about 15 volts. Flipping on the high beams drops the voltage down to 13 or so (I run relays off the alt to the HLs). Still seems a bit high.

Disconnecting the green field wire lets the voltage pull down to 13 or so.

Going to check for a short to ground, I'll also run a jumper to ground on the VR, but I've got a hunch there is an alternator issue.

Update: No short on the green wire. I've got about 500 ohms to ground on the blue wire though with the VR, Alt field, and ballast resister disconnected. That wire splits off in several directions under the dash. Have to dig through the wiring diagrams to figure out if that should have any continuity to ground.