Voltage climbing like that indicates wiring or regulator problem. Part swapping, may lead to damage of new parts. Best to use a meter, check field wiring. One goes to 12V IGN, often blue wire, the green goes to regulator field terminal. If the green wire is shorted to ground, the possibility that 67Dart273 suggested, then that would result in full field problem. With green wire disconnected at each end an Ohm meter test to ground could be used to test for short, it should read open.
