If you step only works when you turn on the engine, then very possible that your house battery is too low. When you started the engine, the charger put the full charging voltage on your battery lead and that provide the full power to the step motor, that was why it work correctly when your engine was on.
That said, you may want to plug in your rig the shore power so it would charge your battery fully, then your step will be back working normally.
However, since you have depleted your battery too low, the chance is your battery life may not be so good to hold the charge anymore, so don't be surprised that your battery will deplete quicker than before.
Good luck and have a great day.
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Tam & Ha from Willis, TX
2016 Georgetown XL 352QS
2011 Jeep Grand Cherokee
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