Be sure to check for a short between your ground and common (green and white wire). Unplug the RV from power. Check for a short with an ohm meter. All extension cords should be in place. Start at the adapter. Disconnect each adapter and cord, as you work toward your problem. Unplug each utility one at a time. As you should know, no circuit breaker disconnects the ground or common. To disconnect an item, it must be unplugged. For hard wired items, the ground wires must be removed as well.