when I've had overcharge issues it's always been the voltage regulator had a poor ground. anymore I run a pigtail off the regulator and ground it to the block.
On the electronic reg with dual fields the car wont charge if the reg is not grounded since that's the field ground. Course you may be talking of the older mech regulator only ? Working many years at a Dodge dealer I found the two wire connector on the electronic reg would loose its connection at the reg for the batt sense wire but the field wire still had a good connection and of course it would overcharge without knowing batt volts. Unhook the field wire or wires depending on your reg and see if it stops charging like was said. Ron
