I have 2005 Ford Explorer — “Check Charging System” sensor light comes on intermittently, mainly while idling at stop light (< 2 seconds each time). When I run "systems check" says all systems OK though. I replaced with new battery yesterday; alternator only 1 yr old – mechanic said was fine yesterday. But, sensor light keeps coming on again today. What's wrong?
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This light comes on when the alternator is not keeping up with demand. If you have extra stuff plugged in or an aftermarket radio system this is a common issue. If this was an Autozone bought alternator from a year ago, go get a new one….