As suggested check for codes. On my 08 I only had a problem with the stator and it needed to be replaced so I would lean toward a stator problem. I haven't had any problems with the voltage regulator yet, most of the time the voltage regulator is either good or bad but the stator can go bad a little at a time.
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08 FLTR candy red sunglo,with 2015 103 HO, V&H Dresser Duals with Monster Rounds, Power Vision tuner, Willy Shiny Wheels and Forks and a bunch of other stuff.