Battery light problem

Asked by Nov 14, 2016 at 12:34 AM about the 2000 Pontiac Grand Am GT1

Question type: Maintenance & Repair

I have a pontiac grand am gt1 v.6 4dr sedan the
other day i left my interior car light on and when i
started my car the next morning the battery light
was on. i went for a drive than about 15 minutes
later the other warning lights came on then car
started to die down. I replaced the battery and the
car starts with no issues but the battery light
comes on after i start it.. anything i can do myself
to check what the reason to be?

1 Answer

72,455

With the engine running you should have around 14.5 volts DC at the battery terminals. You can check it with a voltmeter or an auto parts store can check the charging system. Most stores will do it for free. Sounds like the alternator is bad. But check it to be sure. Do NOT disconnect the battery with the engine running! That's a very old time way to check the charging system that can't be safely used on a modern car! It will create a power spike that will fry electronic components such as the computer!! HTH. -Jim

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