I purchased my first camp trailer this year (2010 Coleman Santa Fe) and just went out on my first trip this past weekend. I purchased a new battery and had it on the charger up until the time I left. I got camp all set and went to turn on a light and check that the heater was working because I expected a cold night. The lights would not turn on at all. I started testing other electrical in the trailer and just no power at all. I pulled out the multimeter and tested the better, which was at 13.05v so to my knowledge I was super topped off on power. I confirmed that my connections were on the battery correctly and flipped the breakers off and back on, still nothing. I checked to be sure the fuses all looked good and they looked solid. The galley was up so the kill switch was not the issue, unless during the drive the switch decided to go bad. During the drive I encountered some snow and salty roads so the ground wire seemed a bit corroded so cleaned off the connection and tightened the connection, still nothing. When I was at home getting ready I had the trailer plugged in so everything was working. Previous to that I used the trailer on battery power not more than two weeks ago. The reason I ended up with a new battery for this trip is because I had some of the family over and the kids were out playing in the trailer and left the lights on all night. When I got back to the trailer the alarm was making a terrible sound and the lights were completely off but still switched to the on position. I switched off the lights and the sound went away. I assumed that battery was toast so I'd get a new one for the trip. Obviously something else went wrong there. Any ideas on what could have happened and how to fix it? Are there fuses somewhere else that could have blown or kill switches that could have been tripped and need to be reset?