I'm unfamiliar with your RV, but they are usually designed in a similar fashion. I'd start by looking at where the shore power comes into the unit. It is usually connected to 120 v breaker panel. A branch of that power will go to a converter/charger that keeps the 12 v batteries charged and provides 12v power to all interior functions. On that converter/charger is where the 12 v fuses are located. As I said, start with the shore cord and work from there. The converter/charger might be tucked under a cabinet, refrigerator, closet, dinette seat, etc.