Yeah I suspected the rectifier was going bad,
Buy a new voltmeter.. mine died year ago
blew the fuse on the new one, when I forgot to set it properly after testing the internal battery.
Buy fuses
test MC battery .. marginal 12.5 volts
Drop the exhaust... wait go buy a LOONG hex wrench
Test the rectifier .. 18v
To remove the unit
remove battery.
remove all bolts to the battery box
remove unit
Go to the bike shop new unit is $120, to be shipped in next week
This is going to be a royal pain to put back!!!