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The ultimate alternator test is to turn on all of the accessories at idle (one at a time) while watching the voltage to make sure it stays around 13V.
Headlights, high beams, fogs, blower, A/C, rear defogger, etc. With everything on at idle speed, and a voltage around 13V your charging systems is good.
Last edited by djnolan; 01-18-2022 at 02:39 PM..
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