If you have the tow package wiring in the truck, check the wires around or behind the battery. The tow package harness is feed thru here and each wire has a fuable link that can go bad. Check for power on either side of the bulge in thw wire (this is the fuable link). If you find that this is the problem, you can cut out the fusable link and splice in an aftermarket in line fuse holder to maintain protection against shorts.
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