Assuming you have a multi-meter, preferably digital, just place the meter leads on the positive and negative battery terminals and check the voltage while at idle. Anything over your at rest battery voltage can probably be counted as charging. If you have a charging pigtail attached it's even easier. Just take the readings at the plug.
You want it between about 12.5 at idle and 15 volts max - if it drops below 12.5,you need to check the stator wires (3 yellow ones) by disconnecting them and on the AC meter setting, check 1+2 - 1+3 2+3 ,polarity doesn't matter. You should have about 55 volts AC at 3000 rpm - if charging over 15 volts dc,the regulator is gone and shut the bike off quickly ( learned this with my KZ1000
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