1999 Chevrolet Express Night After Driving Highway About 10minutes Voltage Gauge

1999 CHEVROLET EXPRESS
118,000 MILES
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GSTEELE55
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At night after driving the highway about 10minutes the voltage gauge drops from 14 to about 10 or 11 and the lights start to dim. When driving at slower speeds around 40 mph this does not happen. Any reason why?
Jan 26, 2013 at 3:46 PM
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