Set your volt meter to continuity, and ground your black lead on the engine case. Touch each one of the white wires with the red lead, and you should have NO continuity. If there is continuity on even one wire, your stator is shorted to ground. No continuity, no short to ground. This test is done with the engine NOT running.
The second test you can do is to set your volt meter to AC volts, and with the engine running, put your leads on two of the white wires and you should read AC voltage. Rev up the engine and your reading should jump from around 30 volts to possibly as high as 120 volts. This is where the manual comes in. Don't run your engine for more than a couple of seconds with the stator unplugged. If the stator tests good your problem is probably in the regulator/rectifier.