OK let's eliminate some things first.
Have you checked the battery? Is it good?
tight connections on both poles and right wires going to the right poles?
Check all of the fuses in the fuse panel and the inline fuse from the battery.
What type of w/h do you have? Gas or gas/electric?
Not trying to make you feel dumb but the info you provided is a little limited for a good answer.
[SIGPIC]TV-2012 Ford F250 XLT Supercrew 4X4
TT- 2010 Jayco Jay Flight 17Z (traded)
TT- 2012 Coachman Catalina 30BHS (current)
Me and my wife with 3 kids love camping!!