Look in the Front Distribution Panel. It's a black box inside the outside-accessed bay that's under the driver's left foot. Should be fuse 67. It's on the unswitched house battery bus, along with the LP detector, radio memory, and a couple other things (depends on the coach model and options). I've circled the fuse in purple in the attached GIF file.
2008 Holiday Rambler Admiral 30PDD (Ford F-53 chassis)
2009 Honda Fit Sport