The way to Examine the Output of a Chevrolet Alternator 1Start the vehicle. If it doesn't commence, attach the battery pack for the battery. Try to begin the automobile. If the vehicle nonetheless will not commence and also you know the battery is dead, charge the battery using the charger for at the least six hours.2Set the voltmeter to 20 volts.
Touch the positive battery terminal with all the red lead. Touch the negative battery terminal together with the black lead.3Read the output on the alternator. In the event the voltmeter is putting out 13.5 to 14.5 volts, the alternator is adequately charging the battery. Test the alternator further by turning on each of the lights plus the heater. The voltage should really drop for any second or two Professional diagnositic tools, but ought to go back up to at the least 13 volts.
If not, the alternator is charging Auto diagnostics, but not properly.4Turn off the Chevrolet. Hold the voltmeter's red lead on the good battery terminal and also the black lead on the negative terminal. Have a helper start the automobile whilst you watch the voltmeter. When the volt meter drops below 10 volts, the alternator isn't placing out enough amperage and really should be replaced before it quits fully.
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