Check the relays located at the top of the Battery Bay. The fuse and the four relays are in the plastic enclosure. You can switch relays by unplugging them.
If the relay clicks check the voltage at the plug on the motor.
Had a similar problem last year with the bedroom wardrobe slide and found that the wires in the connector had never been crimped when built!!
2005 Monaco Knight 40PLQ
2013 Ford Edge