I just got it and after opening the tailgate twice it won't open anymore. It also doesn't roll down the window with the key anymore, i can only do it from the switch up from. Anybody have any ideas what it could be? Thanks

 

Is the Key worn down a lot???? If it is then the tumblers in the lock may not be engaging correctly for the switch to turn on. And if that is not the case then you may have to open up the tailgate to check wiring from key switch to motor, wire severly corroded and needs replace or has broken inside sheathing and needs to be replaced....