an electrical nightmare , please help , 1972 dart

Then there is something causing field power fed to the alternator. FIRST thing to do VERY first thing is to disconnect both field terminal connections, and ohm the terminals to ground. Both should be OPEN (infinity) to ground, and just ?? a couple IE very low between the two. Check your connections and wiring to the field and VR

I have forgotten, you must be? using the 70/ later VR with the triangular connector? If so, the field terminal connected to the green wire is likely grounded.