Update
so the bike has the Compu-Fire Voltager regulator on it.
I think its this part, looks like it anyway.
55130 1989-'99 B/T - 32 Amp Chrome Billet Case, OEM #74519-88A
Did the test on the stator, and its .1 Oms across the 2 pins. (PASS)
nether pin is grounded. (PASS)
Started bike, and 2.875v AC at idle.... (FAIL?)
So the sator is bad I guess? But working a little bit so maybe that why bike stays running just not charging good?
Or maybe the Rotor is bad and not spinning right cause of teeth?
Also rode for 20 miles, Voltage had dropped to 12.06 after the ride. So it's slowly sucking battery down... Ride 20 miles back home, 11.6v.. Time for charging system.