Then it sounds like it's either the motor, a connection (power or ground connection), or an in-line fuse near the motor. You really need to find the motor to diagnose further.
I don't know your floorplan, but my slide's motor is inside (away from weather), under the fold-out couch. Is there ant fixed furnature or cabinets near your slide that it could be tucked under?
2014 RAM 2500 Laramie 4x4 Quad Cab w/Cummins Turbo Diesel, 2009 Rockwood 2607, and 3 'yaks!
300W of Suntech Solar, a Rogue MPT-3024 Controller, and a Xantrex PW2000 Inverter