Your year and model is not listed. If the bed is in a slide, I would suspect an issue with the wiring under the bed. Raise the bed and remove the floor panels and take a look. There may be wires that move with the slide and have become pinched/loose/disconnected ?
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2018 Chevy 3500 LTZ Dually Diesel 4x4 CCLB
2011 Montana 3455 SA. 6 point level up. Disc brakes. Curt Q24 Hitch. 5 step glow steps
Progressive EMS. Valterra tank valves. Sailun G637 tires. ARP fridge control. All led lighting. Mor Ryde IS
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