Hack: Thanks. No, I lost my cheapo voltage regulator, so I went out and purchased a digital meter this afternoon after work. Yes, I will likely install the heavy-ever duty aftermarket alternator bolt on kit this winter after I save up the $575 dollars. The stock alternators on the /7 puts out only 280watts. I want to run some plug in gear this winter to extend the season. So I want a beefier alternator.
Well, interesting I ran the voltmeter at the headlight bulb...at idle it hovered around 12.5v. Upon increasing the throttle to 3,500 it shot up to 17.5 volts. I think that is enough to fry a 12V 55/60 halogen bulb, isn't it? The other issue is with the tail light I have an after market LED tail light. It is a 12V, but maybe that withstands voltage surge better than the filaments in the stock bulbs.
I order an aftermarket voltage regulator for $32. Well see if that helps.