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In order to see if the Alternator is actually working properly you need to by pass the voltage regulator to see the actual amp out put for the Alternator. If you don't, you may not find the source of the actual problem, ie faulty regulator. Also, if the fan belt has turned slick on the underside of the belt, it will not grip the pulley well enough to allow a charge from the alternator (have found this to be common mis-diagnosis by many shops in that the fan belt is actually burnt underneath but you can't see it slipping on the pulley therefore the alternator isnt' charging and they replaced alternator, regulator, and continued to not fix the problem until I found it to be the belt ), otherwise, check your wiring on the alternator and regulator, and go from there. Make sure you use an actual machine that tests the output on the vehicle. Good luck.
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∙ 15y ago
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