This probably does not help you folks much, but the steps are usually powered from chassis battery. On my 2013 ACE, which is equipped with the RV Custom BCC located in the engine bay driver side front, the step motor and step related control fusing is actually located inside the BCC. Step motor is a 25 amp fuse and the step switch is a 5 amp fuse......in case that helps if they use similar sized fuses in the newer ACEs. I am pretty sure that new ACE units do not use the RV Custom BCC, but I would expect by contacting Thor tech you should be able to get direction to where the step fuses are located. Failing that, I would try the fuse panel at the driverís left foot area first (assuming that is still its location). Good luck.