Run a ground wire from the battery neg. post to one of the reg/rect. mounting bolts to verify it's still grounded good . I mounted mine on the airbox intake when I build my E-start bike and the bike would only run till the battery hit the shut-down voltage for the TCI . It showed charging voltage but due to no grounding of the reg/rect. wouldn't go into the battery .
I'd think if the stator was bad it wouldn't show normal volts at idle and then higher volts when rev'd plus be right in spec. I'd guess somethings going on with the light/light switch or wiring shorting out when running and draining the battery.
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