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Let me know what they say, I'll be curious.

That's just a voltage test. I was having issues with my alternator and it tested 15V running and the battery was 12.5 off. Took both down to O'reiley. They tested both and both were bad. They need to be load tested, a simple voltage test wont tell you much.

Sounds as simple as a bad battery and voltage regulator as its systemic, not localized. Battery is dead, alternator can't charge enough to keep the electrical systems going and they are turning on and off as they receive a charge. Pull your battery and alternator and take them to your local...

Hi Hoping someone can help: 2009 Tahoe LT 5.3 I installed a new alternator due to a bad bearing and found the battery was bad so that's now new as well. When I turn all the interior lights on with the dashboard knobb thing they flicker/dim. Nothing else does. Headlights, dash illumination...