fuse out?

Hey guys,

Just got back from our first trip in the new TM, but we experiences a problem. Plugged into the electrical hookup at the site, power went to all systems fine. When it came time to put the kiddos to bed all power in the rear of the unit went out (lights, lp detector). A quick check of the fuse box showed a red light next to the 20amp fuse for the rear of the unit but the circuit breaker was fine. I thought that the fuses were for 12V power, which should not have been active when I was plugged in correct? any help would be appreciated, thanks.