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
How_do_you_check_your_voltage_regurlator_on_your_motorcycle
with a kohler regulator tester
with batteries and a knife
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.
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
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.
You will need to go to a repair shop and have them test the charging system.
have the battery checked and test the voltage regulator