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Ok guy, I'm getting beat up on this one.  2015 Silverado, headlights flickering and a few other strange electrical issues. I've done the following:

- new battery

-new alternator

-cleaned up ground connections- 2 on the front near the tow hooks, 1 on the frame that goes straight to the battery, the ever famous G218 in the left corner of the dash

-new negative battery cable

-took to dealer that did "thorough check" and still found nothing

 

Still have flickering headlights and if I hit my window up switch when the windows are already up all the electrical in the dash goes dead for a few seconds and comes back.  

I'm ready to set this thing on fire. Any advice is appreciated. 

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