Just had a similar issue. Ended up replacing the r/r with Shindegen (SP?) R/R. After learning from these awesome guys on this forum, I troubleshooted the crap out of the bike and the stator came out good (knock on wood) on all tests.
Whether it is the R/R or not, I would recommend going ahead and buying a Mosfet R/R. If you have to replace the stator, you will also have a new and much improved R/R.
And a voltmeter, definitely get a voltmeter for your bike.
2003 VN750 de-goated
Kuryakyn ISO Grips
Kuryakyn LED Voltmeter
Slipstreamer Hellfire windshield
Shindengen Mosfet R/R
Kawasaki Engine Guard
Fire & Steel Footpegs
Need Knifemaker to make me a seat like his