turn the bike on let it run and do a voltage check on the battery terminals. it should be at high 13's into the 14 voltage area. turn the throttle to see if the voltage rises, then let it go again. if it's bad then the voltage will drop again once the bike idles again. another test is to put an ohm meter across 2 of the three yellow wires the stator has. if the resistance is not between 0 and 1 then there's a short. so do a test. wire 1 and 2, wire 2 and 3, wire 1 and 3. see what you get.