My guess is that, if the motor makes noise when you depress the button, the electrical part is OK and that you should look for a binding problem. If there is no noise, or nothing happens until you jiggle motor, the you have an electrical problem.
Happy Camping! ///// Richard D.
2006 4x4 Ford 250 SD / 2007 Flagstaff 827 FLS
One very patient wife and one furry child who travels with us. Forty-two years of trailering and camping, and I still have a blast.