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2019 Silverado 5.4 lt

So trailer lights work tested them on another truck. Used tester on fuse and no power is going to the (R) trailer blinker/brake. Couldn’t get an appointment til Monday at dealer and even then they said they might not be able to diagnose the issue in 2hrs being that I need a vehicle for transportation for work and them not having an available loaner. If anyone has any ideas please let me know. I even checked the wires going into the trailer harness and nothing is loose or missing(not sure if that would have anything to do with it). 

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