Question about 1986 Pontiac Firebird

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I have a new battery and alt but my car is not charging the battery do u know y?

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  • Pontiac Master
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It is important to trace the fault with some basics. so first of all since you have installed the alternator, I would like to request you to have a good voltmeter or a multimeter to check our voltages. If the connections were given right to the alternator and the battery terminals are connected tight then start the vehicle and check for the voltage across the battery, Ask a bystander to rev up the engine as you check to see if the voltage across the batttery is increasing to maybe upto 15-16 volts.If so the charging is Ok and the fault could be the battery itself. If not check the voltage from the alternator to the rectifier unit. If there is ac voltage from the alternattor then it is your rectifier/ regulator unit which has failed. Replace and test for the charging. It will be OK. Hope this helps. Good day

Posted on Jul 21, 2010

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Posted on Jan 02, 2017

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