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Chevy Tahoe electrical issues

medic206medic206 Posts: 1
edited August 2014 in Chevrolet

I have a 2006 Chevy Tahoe. The voltage drops while I'm driving from 14 to 11~12 volts. I have changed the alternator and the battery and it is still doing it they have both been tested I was told that there is a fuel economy mode is there or could it be a grounding issue if so what do I need to do

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