How To Test Alternator Multimeter. The minimum volt that it should show is 13 volts because a good condition alternator outputs around 13 to 14 volts. This video will cover the following-----How to test an alternator using multi meterHow to replace an altern.
A multimeter is a handheld device used to measure voltage and test electrical connections. Set the Multimeter to Volts DC. Your voltmeter should read 0 AC volts.
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Turn your meters dial to Volts setting and select AC since an alternator produces alternating current. Turn on the meter. With the engine running touch the meter probes to the battery terminals. Any amount of AC voltage indicates a bad diode - youll need to replace the alternator.
