I have an old generator (not alternator) that was overcharging the battery due to the external regulator stuck on. The voltage was reading over 16 volts and rising. I perhaps stupidly removed the B+ armature wire from the generator and continued to run the engine for a few hours leaving the field wire connected. (Perhaps causing over voltage within the generator?). After getting a new external regulator generator is not charging when connected to battery. To test I applied full voltage to field and only get 10 volts with evennothing connected to B+ armature stud with engine running. Increased engine speed and voltage actually dropped. Tried polarizing generator with no luck. Removed belt and applied full voltage to field stud and it spun really fast and disconnected before it maxed out as I think it could have spun too fast. Connected full voltage to B+ armature terminal and generator spun but slower than idle speed but it was spinning none the less. Not sure if this means anything as far as what the issue may be. Also would powering the field with nothing connected to the armature damage the internals in some way?
Thanks in advance,