I’m going to assume here that the lift gets its power from the camper batteries. Start there with a multimeter (voltage?), Disconnect the batteries and either try a jump box or a different battery. You should hear the relays click, did you check the fuse with a non LED TEST LIGHT? If you work your way back to the batteries and nothing then try supplying power directly to the motor.
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JOHN
People Sleep Peacefully in Their Beds at Night Only Because Rough Men Stand Ready to Do Violence on Their Behalf
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