why is my voltmeter reading over the end of gauge

2003 GMC SIERRA
122,000 MILES
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MILNE
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The battery reads normal at 14.7 volts. can i just change the gauge? new alternator and battery. Any ideas. i appreciate your help.
Jan 8, 2012 at 12:33 AM
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RASMATAZ
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The voltage regulator has gone bad inside the alternator.
Jan 8, 2012 at 12:51 AM