Bill, Thanks for the update. In the door jamb you will find 4 spring loaded brass push button switches. They are used for the step operation, entry light, ect. Make sure they are not stuck depressed and making good contact with the entry door buttons.
If you can raise the coach safely and block it so you can get under it, check the green 10 gauge wire for a good ground connection to the frame. Look for a 4 wire plug with red 10 gauge, yellow 14 gauge, white 14 gauge. and brown 14 gauge. The red 10 gauge is the main power source (12 volt) yellow is ignition over-ride, white is step switch at the entry door and the brown is the trigger to open or close the step. CAUTION: the scissor assembly that extends and retracts can chop your finger off so be careful. If you can remove the pin, extend the step and remove the motor. Using jumper wires from a battery or charger, hot wire the motor and see if it works. If no joy, replace the motor. If the motor works, reinstall and all will work as before. (you have relocated the commutator to a new location by testing it) Good luck and hope this helps, Fred