On my '08 27FB, the disconnect switch is located just inside the door next to the light switches. It is labeled Use / Store. It is a momentary rocker switch that can get accidentally bumped particularly if there are any youngsters around. In the store position it disconnects the battery from the converter and circuits fed from the fuse panel. The jack and LPG detecter are still functional. Red light on panel next to switch can be misleading. As I recall it is always on regardless of state if plugged into shore power. If no shore power, light then indicates if battery is connected or not.
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Air Safe Hitch, Reese Dual Cam 800#, Centramatics