When the trailer is hooked up to your 2013 Ford-F150 and the tail lights and the running lights work but the brake and turn signals do not means that you will have a wire loose somewhere on the vehicle side of the wiring. I would recommend using The Hook Probe Circuit Tester Kit # PTW2993, this will be able to check each wiring function on your vehicle side plug and you will be able to find out which one is loose or could also just be a bad wire. With my educated guess though it sounds... view full answer...