Question about 1999 GMC Sierra 3500
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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Posted on Jan 02, 2017
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