There are a few folks on here that have had that issue, including my brother in law in Canada, first, see if you have power to the motor, if so, you probably have moisture in the motor, I had to pull it off there 5ver, tear it down and found that one of the brush springs had rotted and was not making contact with the armature, replaced spring and all good to go. If you do this, I would silicone the holes in the body of the motor shut so it will not happen again....
99 Freightliner FL70 Western Hauler CC 300 HP Cat/Chipped/ Allison Auto
12 Montana 3800RE/Level-Up Auto Leveling/Slide Toppers/MorRyde Hitch/VuQube 2000
01 F350 7.3 PSD Crew Cab DRW 4X4 6 Speed/Chipped