I dunno if this will help, but at this point I'll toss it in.
I don't believe it's relevant to your problem, but it may send you down the correct path.
I just pick up my Military and last night I was all set to take it out to, "run it in".
When I turned the handle bar all the way to the right the bike died! No power.
A few curses and a few checks reviled the main fuse popped?
??/ ??
Put a new one in and refire it up, turn the bars and... same thing.
This went on for 4 fuses, trying to narrow down what in the world? Yank a wire here, push a wire bunch there.
I took the head light assy out and began looking at all the wires, connectors.
Where the turn signal plug in, the male part was a 1/8" longer than the plastic shield, and when I would turn the bars, somewhere it would rub against metal and POP!
I'd pull your head light assy out and lookie at the connectors. Tape up ANY that look like they are exposed.
After that, I'd look at the over all voltage.
I'd take a multi meter and wire it to the battery and tape it to the bars and look at the voltage when it's running.
In the real world voltage would be less than 14.5,but anymore than 12.5 volts would be cool . Check when you rev it up, that's when the max would be max!
You would think if the regulator was bad, you'd see it in the amp gauge on the dash? It'd go WAY over when you rev-ed it up??
Do your metal boxes rattle?? Mine do.
Good luck and keep us posted.
Joe
I ride, therefore I am!