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local guy explained how to test the stator, rectifier and battery:
"1) Charge the battery overnight (7~12 hours), not to exceed 24 hours. You may exceed 24 hours if you are using a ‘smart charger’.
2) Disconnect charger and allow battery to stand for 30 minutes. Check the battery voltage with a digital voltmeter. The voltage should be around 13.3~13.5. If the voltage is less than 12.5, replace the battery.
3) Install known good battery into bike and start engine. After warm-up, bring engine speed up to 5000 rpm and measure the battery voltage at the same time. The voltage should be about 14~14.5 volts. If the voltage is greater than 15, the problem is most likely the rectifier/regulator. If the voltage is less than 13.5, then it’s either the alternator (stator coil) or the rectifier/regulator, or possibly even both.
3a) SIDE NOTE: A problem that seems to occur with sportbikes rather frequently is the 3-terminal stator coil connection fails and the resultant heat from the I*R drop melts the connector. In addition, the red-wire contact on the rectifier/regulator connector also has a history of oxidation/corrosion. Be sure to check these!
4) To check the stator coil (alternator), measure the AC output voltage between all three stator leads (1 to 2, 1 to 3, 2 to 3). The AC voltage should be at least about 10 volts AC for every thousand of engine rpm. Test the AC output voltage up to about 5000 rpm."
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