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2012 sierra, headlights flicker

MrBooger

By MrBooger
in Ask A GM Technician

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MrBooger Enthusiast

MrBooger

Posted
Posted

I have a 2012 sierra, 5.3 cc z71. Is it normal for the headlights to flicker, and it's a good flicker, when the a/c cuts on or off? It happens while at idle and when driving. I also noticed, when at idle if i press the brake, i can see the interior dome lights slightly dim. voltage guage shows correct.

MikeNH Senior Enthusiast

MikeNH

Posted
Posted

It's normal. The alternators are designed to out out minimal current to increase fuel efficiency but this is what happens. You'll also see them dim if the ABS/traction control/stabilitrac kicks in.

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