Join Date: Jan 2011
Location: Cambridge IL - USA
I agree with checking the charging voltage at the battery terminals, first prior to starting and then after it is running. There should be at least 12 volts at rest and can vary from around 13.2 - 15 volts when running.
Has the battery been load tested to verify condition? A simple volt meter reading is insufficient to determine battery capacity and condition.
If the alternator and battery are indeed good; then there is a charging circuit issue, if the charging voltage is the same as the static voltage of the battery.
2019 Chevy Equinox; 2.0 - LT - FWD - Silver Ice/Redline - Purchased 10/20/2018; Mills Chevrolet, Davenport IA
2016 Chevy Equinox; 3.6 - LTZ-AWD - Black/Black - Purchased 7/7/2016; Mills Chevrolet, Davenport IA
2017 Chevy Malibu; 1.5 - LT - Pepperdust - Purchased 8/2017; Green Chevrolet, East Moline, IL
2009 Chevy Silverado; 5.3 -LT - 4WD - Ext. Cab - Granite Met. - Purchased 02/2009; Green Chevrolet, East Moline IL