How To Change An Alternator

Test the New Alternator

As a final step, test out your new alternator by starting up the engine. The warning lights that probably alerted you to your engine trouble in the first place should no longer light up. Listen for a squealing sound in the pulley that can indicate that it’s too loose; on the other hand, be sure you have not over-tensioned the pulley. You can also test that the alternator is properly creating a charge by testing the current with a multi-meter.