Usually the voltage supplied to your battery when the engine is running is about 13.5-14 volts max. If the output is higher or lower than 12 volts, then the regulator could be faulty. hope this helps
How_do_you_check_your_voltage_regurlator_on_your_motorcycle
A charging system test is done to check the internal voltage regulator. It can be done at any auto parts place.
with a regulator tester kohler sale one that will test most regulators
with a kohler regulator tester
You need the test equipment and a bunch of knowhow.
With engine running, ensure system voltage is in the 13-14 volt range.
it is inside the alternater, not stand alone.
check for stator AC output first, check specs for your year, that has to work properly under load to go any further, then check for 12.75-13.50 VDC at the battery with it running, if it tests OK at the stator plug and shows battery voltage dropping instead of climbing at fast idle, suspect the rectifier/regulator It is impossible to test the rectifier, but it is built into the regulator/rectifier and you can test the regulator. Buy a manual!
To install a new wiring harness for the voltage regulator on a 1990 Mercury Topaz, first, disconnect the battery to ensure safety. Remove the old harness by detaching the connectors from the voltage regulator and any securing clips. Connect the new wiring harness to the voltage regulator, ensuring all connections are secure and properly aligned. Finally, reconnect the battery and test the system to ensure the voltage regulator is functioning correctly.
have the battery checked and test the voltage regulator
You will need to go to a repair shop and have them test the charging system.
Voltage regulator a loose connection. Look around the switch. No loose wires or corroded terminals? Get a new regulator and put it on. Really the only way to test it on older bikes.