leonreno, thanks for the suggestions. I managed to forget my electrical tools at home when I went on this trip, so I did not test the voltage or spark. I am hoping that the problem will manifest itself next time I have a chance to work on it. I will have my tools ready.
I tested the stator at the end of last season and it checked out. Now that you mention the regulators, I did notice that the tachometer was acting wacky and jumping around on several occasions this trip, but only when I was trying to start the motor. Perhaps that is an indication of an electrical issue?