To fully test the stator you also need to do 2 tests, one with a cold bike and the second after the bike has fully warmed up for a while. This is where having a voltmeter on the bike is handy.
What happens is the stator may show all is well on the cold test but after it is running a while a short to ground may appear.
I had some of the same issues and the stator tested find when cold. But would not start back up after a run. Then I noticed that after starting up, about 3 miles or so down the road my voltmeter dropped (warmed up stator and a short to ground appeared)
Patriot Guard Rider
2000 VN750 Sere (Serendipity)
1990 GL1500 (Ole Blue)
1986 VN750 EVie (project bike, heavy custom)
VROC # 11628 / 25000-H
ARVROC # 12 Coordinator and Crowd Control
OKVROC # 18 (H)
TNVROC # 45 (H)