Almost sounds like a controller but it could also be relay or wiring issue with the ignition.
Another thread I just read today sugested a window switch installed which would let you manually retract/extend the steps.
But check the wiring to the controller to make sure nothing is broken. Disconnect the motor first or you may get some pinched hands or fingers. Connect a votmeter to the disconnected leads and monitor the polarity reversal. Beats injuring your hands The meter will tell you when you got it fixed. Then reconnect the motor. Again watch fingers.
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98 Endeavor DP, ISB275
RX300, Falcon II hitch, BB Vantage Select
VMSpc, 2002 Grey Ford Powerstroke
TST 507 w/ 10 Sensors
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