How to test an alternator


The specific steps of the test light method are to remove the wire connected to the alternator "armature" terminal, so that the alternator armature and battery disconnect, and then make the engine run at a low speed, the light bulb end of the lead to the alternator "armature" If the bulb lights up, the alternator is normal, otherwise the alternator is faulty.

James Smith        September 10, 2020
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