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Take a close look for damaged insulation on the taillight wires where they are exposed to road debris thrown by the rear tires, and check the wiring to the license plate lamps (if any remain). If a trailer wiring plug has been added suspect it and all wiring from the original harness to the trailer socket. At an auto supply store you short be able to find an auto-resetting circuit breaker that will plug in in place of the fuse. (Match the amperage.) With the breaker in place you can crawl around under the truck and wiggle wires until the breaker trips, helping to narrow down the problem. If you do that in a darkened area, you may even be able to see a spark where the short is under the vehicle. I have a 1984 Suburban with beat-up taillight wiring that would occasionally blow the fuse. About 2 months ago, I replaced the fuse with a breaker, and taped things up a bit behind the LH rear wheel, and so far the breaker hasn't tripped. The breaker is kinda nice because if it does trip at night, it will reset when the lights are shut off, and it saves having to rummage around under the dash to replace a fuse while on the road!
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