Question about 1999 GMC Safari
Not necessarily a problem. It depends on MANY things. If you are running lights, heater or AC, brake lights, all of these things can cause what you describe.
At speed (2,000 rpm or so), you need to be 14 volts or higher.
Fully charge, then load test battery.
If Battery okay, then load test the alternator to check output amps. If no tester is available, often parts stores will test for free.
Posted on Jul 28, 2010
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Posted on Jan 02, 2017
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