Answer
Nov 25, 2025 - 09:53 PM
If the light comes on when you open the door, that tells us a few important things:
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The door switch / sensor is working
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The control box has 12 volt power and ground (at least enough for the light)
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The problem is downstream of the controller: motor circuit, gearbox, or control box output
Ranked from most common to less likely:
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Bad motor or jammed gearbox
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Bad or weak ground / power feed at the step motor
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Control box output failure
Do these with the coach safely parked, wheels chocked, and somebody at the door while you watch the step.
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Listen closely when the door opens or closes
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Do you hear any click from the step motor area or control box?
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No click at all: lean more toward control box output / wiring.
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Single click but no movement: motor or gearbox is often locked up.
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Check the step ground
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Find the ground wire from the step assembly to the frame.
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Pull the screw/bolt, wire brush or sand both the ring terminal and the frame to shiny metal, put it back tight.
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Retest. A bad ground is stupid common on older Kwikee steps.
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Try helping the step by hand
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With power off (pull the fuse or disconnect battery), see if the step can move by hand through its travel.
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If it is locked solid, there may be a mechanical bind or the gearbox is seized.
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If it moves freely by hand but never with power, that points more to electrical (motor or controller).
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