The 3 power outlet combo on the dash has stopped working - appears to be blown fuse. I have tested those on the diagram - all are good. Where the &*%! is this fuse?
You have 3 fuse boxes. 1 under hood, 1 on the side of the dash when you open the door and 1 on the left side of steering wheel.
check fuses that say AUX power and ones that say CIGAR or SEO.
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Chevrolet Tahoe (2002) Fuse Box Diagram 
(fuses.guru)
If they are good, then check behind the 3-power outlet for a loose or bad connection or burnt wire.
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Good link. Wow, I can see why OP canāt find the fuse they are looking for, vehicle has a whole lotta fuses. My truck only has 5 fuses ā¦ lol ā¦