[DutchmenSport]

7 pin connector is the same for every truck and trailer. Considering your previous trailer connected with no issues, then it's quite obvious there is a problem with the trailer.

So, a bit more information is needed.

First, do the running lights come on in the camper when you turn the truck head lights on?

Next, does your break controller recognize the "gain" when the trailer is plugged in. If there is no connection, the "gain" when applying brakes will just sit on zero.

Next, any turn signals, 4 way flasher lights, or brake lights working?

If all of this is dead, then my first guess would be you have a bad ground. Are you using one of those silicon fifth wheel hitch pads between the king pin and the fifth wheel hitch? If so, remove it (temporarily) and see if the trailer running lights come on. If they do, then the ground wire on the camper 7 pin is broken. The silicon pad works like an insulator and will not let the truck be grounded.

If removing the pad still does not work, then something bigger is going on.