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Let me mention this about GFI's: A GFI Receptacle (the kind you re-set, with those buttons) can be wired two ways. One way protects only its own two outlets. The other way, the GFI protects its own outlets AND any outlet downstream from it. So in an RV, the manufacturer wants to protect you from stray current injury in the bathroom, the kitchen, and an outside outlet. They can install a GFI in the bathroom and run the wiring so kitchen is next then the outside. It'll trip on a problem in ANY of the three. So if it trips, you may find an appliance plugged into one of those outlets is electrically "leaky" and the testing consists of unplugging everything to see if the GFI will let you re-set it. Then next go see if the outside outlet got wet, since the wetness can trip a GFI.