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How To Know If Alternator Is Not Charging Battery. Check to see how many volts are showing on the meter. Disconnect the alternator lead And start the engine.
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In this video I show how you can perform an in depth testing procedure to determine the health of your alternator and charging system using a basic multimete. There are two things that you are looking for. Usually the alternator takes about 30 minutes to charge your cars battery but this will depend on your cars system.
Answer 1 of 5.
When a car doesnt start many people wonder whether the alternator or the battery is to blame. Once you connect the alternator to a terminal it should show between 12 to 135 voltage scale. Measure the voltage across the battery and the big bat alternator terminal to alternator case. A voltage drop of 25 volts or less is Ok and the alternator is bad.
