Alternator field wires

Sorry "the old man" misread. OK first unhook the green wire at the alternator and see if it stops charging. If not, that field terminal is grounded. Then reconnect it and unhook the VR plug. It should of course not charge. This will tell you if the green wire is shorted/ grounded, which is rare but does happen

Then make DARN sure the VR is grounded. Clean around the bolt holes, etc and remount. "Work" the connector in/out several times to scrub clean.

If that does not get anywhere, I'd guess the VR is bad