trailer wiring

OK, - - just recently purchased a 1999 Ford Explorer (Sport), - - and need to be able to pull a trailer once in a while. So, after checking around (mostly here, thanks), I was able to determine all I needed to do was hook up an '8-pin round' to '4-pin flat' adapter-cable to the capped jack...

Hey guys so I got a ford trailer wiring hook up and also tried the Hopkins adaptor and there's no power going to the the plug but I have tail brake and turn on the ex its a 96 4.0 is there any other fuses I can check the according to the manual its the same fuse for the truck lights and trailer...