1997 Chevrolet Blazer Volt Gauge Normally Reads 15 Volts Run Lights

1997 CHEVROLET BLAZER
197,000 MILES
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the volt gauge normally reads 15 volts. when i run the lights & heater fan, its drops to 9 volts. i hear a whistling noise that appears to be coming from the alternator. it returns to 15 volts when i shut them off. also, the battery seems to be slowly discharging. could this be a problem with the alternator?
Dec 2, 2012 at 2:24 PM
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ASEMASTER6371
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yes, the alternator has failed.

Roy
Dec 2, 2012 at 3:21 PM
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