Question about 1999 GMC Sierra 3500

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I was driving at night the lights slowly dimmed as the gauge slowly fell got so bad i had to stop as the motor starting revivng as i stopped the anti lock light cam on as then i had no lights as it idled i limped it another 4 miles then the lights went out completely not sure what the problem is

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Its either the alternator has give out. or a loose or broken belt. if belt is ok and tight, then at battery there should be at least 13 volts when engine is off. when running, at battery should read 14 to 14.2 volts. if lower than 14 volts while running, replace or rebuild alternator. have a good day !!

Posted on Nov 15, 2010

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