HOW TO TEST AN ALTERNATOR

In this video, you will learn how to test an alternator. It will also teach you how to test the battery, which is an important step before testing the alternator. Watching this video will help you diagnose whether it is time to replace your alternator. You will also learn how an alternator works. This video also teaches you where the alternator is located.
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Repair Manual mentioned in the video:
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[Patrolman.]

I prefer to use an amp clamp on the negative side of the battery wiring that grounds to the engine.

This will show you how many amps the battery is taking, and if it's negative, then it's likely the alternator broken.

[abdulbeany]

Hi my voltage drops from 14.2v to 13v when i put eveything on lights heaters radio etc is it bad alternator

[Chadmob]

My odb2 is reading 12.9 under load with radio, ac, high beam headlights and hazards on . Probably time for alternator or is a multimeter more accurate?