So, you obviously didn't have the regulator housing grounded to the generator body with a separate wire like I reccomended. Relying on body-to engine grounds through things like the driveshaft, etc. is very risky business. They can change resistance anytime you hit a bump, etc.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!