Update: The dealer gave me some test voltage specs. Did the diag and found it was charging slightly at idle, but voltage dropped as rpm increased. They said bad Reg/rect asm. Also the Main fuse was melted, not blown.
The r/r asm was replaced under warranty in Dec of 2005 at 670 miles. Bike now has about 6k on the odo, same prob. The service manger at the dealer told my son that there was no way they would cover any repair on the bike. I called, pretty much the same answer, but he told me to call Triumph USA to see what they could do. After a lengthy explanation and discussion he pulled up the bikes records. Found it's warranty ended in August of this year.
So he called the dealer and authorized them to check out the bike. The put a reg/rect asm on it (warrantied it

), found the supply wiring from the RR to the fuse block got very hot (melted fuse

). They couldn't find the cause of this. I will hunt it down myself, see what's going on.