Question about 2006 Chevrolet Silverado

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2006 Chevy Silverado alternator intermittent charging

My voltage guage sometimes reads 12 volts when I'm driving. At times it will charge at between 14 - 15 volts. I've recently had to jump start the truck a couple of times because the battery was low even though I didn't leave lights on or anything plugged into the cig lighter. I just replaced the battery and everything looked fine but today I noticed the guage was at 12 volts again. Would a bad alternator charge sometimes? I haven't had any problems with the new battery yet but I'm afraid it's just because it has a good charge on it for now.

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  • Anonymous Mar 14, 2014

    Lights in side just stop working ,tpms light came on and now when pulling in drive way battery light came on , after putting a tester on alternator is only putting out 12 volts so is it a internal regulator or is voltage controlled by the ECM ?? Thanks


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Perfectly normal.
Starting with the 2005 model year, light duty full size pickups and utilities are equipped with a new Regulated Voltage Control (RVC) system. This system reduces the targeted output of the generator to 12.6-13.1 volts when in "Fuel Economy Mode" to improve fuel economy. The generator may exit "Fuel Economy Mode" if additional voltage is required. This will cause the voltmeter to fluctuate between 12 and 14 volts as opposed to non-regulated systems that usually maintain a more consistent reading of 14 volts. This fluctuation with the RVC system is normal system operation and NO repairs should be attempted.

Posted on Jul 22, 2010

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It's not unusaul for a Alternator to act in this Manner Before it goes out Competely. You will need a New one.

Posted on Jan 03, 2009

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Check your fuse block, you most likely need to replace a fuse. Your owners manual will help to locate it. countrycurt0

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