The fuse you are looking for is in the underhood fuse box. its labeled CIG. A phone charger is the most common cause of the fuse blowing.
Testimonial: "This is great, thanks for the help, I was pulling my hair out trying to find it."
Review the GMC Sierra Owners Manual (page 540); is the fuse with CIG LTR label, if I dont mistake, is 20AMP
I hope helped. Good luck (remember rated this help).
It's in the fusebox under the hood on drivers side engine compartment
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