How To Test A Motorcycle Alternator. Set your multimeter to ohms. Multimeter should be set to DC voltage with the decimal point positioned as so.

Multimeter should be set to DC voltage with the decimal point positioned as so. Connect the voltmeter probes on their respective battery terminals. I am the Electrical Guy at my shop.
Make sure the ignition switch is OFF.
Connect the three wiresback on the rectifier and remove the large DC terminal from rectifier. Connect a DC voltmeter with the one ohm load across its terminals and connect one. The alternator generates a current which powers the motorcycle and also recharges the batteryWhen removed from the motorcycle the battery will need to. Trace the wire coming from the stator to the wiring harness and disconnect it.
