Have a kwikee 2 step electric step that won't move. Has power on motor and if you open or close the door the power will switch to other wire and control box relay clicks also. Thinking it's a motor being power is switching. This is a older step coach is a 97 hoilday rambler endeavor. Does the control box switch power and ground or just power. Anyone have the part number for the ford window motor I hear everyone using as a replacement.