Looks like you have a 2018 ACE and I don't think they use the older BCC (Battery Control Cabinet) from RV Custom Products. The BCC box was mounted in the engine bay in front on Driver's side and it did have a 25 amp fuse inside for the step motor (fed off chassis battery). I am not sure what the new ACE's use for latching and battery interconnect relays now though. If you still have one in your ACE I can provide more details.
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