The best I have been able to determine, is the fuse that controls the big foot's are located in the back of the house battery box. There are two fuses back there, and difficult to get to. I have found it is easier to remove the battery, then they can be reached quite easily. I am thinking it's the front (7.5A) that you are looking for. Maybe someone else will chime in on this again, but I am guessing that everything that does not go off with the battery disconnect switch, is fused via one of those fuses behind the house battery. That would include the audio/Navi, the big foots, electric house door locks and the electric step. I cannot remember, but does the electric slide and the awning have to have the battery disconnect "on" in order to work? Good luck, maybe we will be hearing more...