You should have a baggie in the glove box with a fuse and a relay in it. They go in positions 9 and 21 on the power distribution box that sits above the radiator when the hood is open. You must install them before towing if you want 12v at the 7-pin connector. I install mine in May and remove them in November as I learned on the F150forum.com that having voltage on the pin(s) will increase the likelihood of galvanic corrosion on them over time.
The other loose item you should find in the glovebox is a protective cap for the rear camera wiring harness (if you have the rear camera option). I use that one too as I remove my tailgate for the salty months...November through May.
Why remove my tailgate? Well, years ago I had an '85 Ranger and left my tailgate on year round. The tailgate lasted 6 years and was nearly disintegrated. Additionally, I have the camera in my tailgate and although they are designed to be weather resistant, I really don't have faith that they are designed to perform for the next 15 years without some kind of special treatment.
2006 23B Hybrid with 10k round bar WDH
2011 F150 4x4 SCREW Ecoboost, Max Tow, Integrated TBC, 3.73 LS axle, Firestone Ride Rite airbags.