If you’re at a campsite are you connected to the 30 amp or 50 amp receptacle?? If so have you verified that the breaker at the pedestal for this receptacle is closed?? Try opening it all the way and then close it. If you’re connected to the 120 vac gfci receptacle try pushing in the reset button. Also try resetting the 120 vac circuit breakers inside your camper. Let us know how it goes.