In my 2005 Silverado, the fuse you are looking for is called aux 1 and is a modular fuse ( not a spade lug fuse) in the engine compartment fuse block. The wire going back to the 12V pin on the trailer connector was taped and hanging on the side of the fuse holder I had to connect the wire and add the fuse. Also the silverado has separate fuses for the trailer turn signals and running lights and that is in fuse panel on the side of the dash ( drivers door side) Just in case you ever need to find it.
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