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Ok first your tail lighs work of a fues with a test light you can buy cheap at dollar store test all the fuese on the fuese box 1 under the hood the other under the dash under the steering wheel or on the side of the dash board if all fuese r good at night with the lights on check if you have dash light on your instrument panel if no light you have a burn fuse also the tail light work of your headlight switch the only way to check if it's your switch is to remove it n bypass with one wire you'll have a big red wire the will be your 12 volts stick it on that the the other side stick it on the yellow or brown wire if your tail light work u have a bad headlight switch but don't touch any black wire those r growing you'll just burn the fuse those r easy to replace good luck hope I was helpful
American cars traditionally put their dash lights and tail lights on the same fuse so that you would notice immediately when the fuse for the tail lights failed. Find the tail light fuse in your fuse box and check it.
Check and see if you have trailer wiring on your truck. If so you do it may have a wire that is rubbed though the isulation and grounding on the body and shorting the circuit blowing the fuse. High resistance in a circuit is what blows fuses.