Question about 1999 Chevrolet Blazer

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My battery light came on while I was driving. I noticed that the needle on the battery gauge kept going down as I drove home. How do I tell if I need a new battery or if it's the alternator?

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Usually if you remove neg cable while car is running and it dies the diode in alternator is bad.take to parts store and have a tester put on batt its free

Posted on Sep 06, 2010

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