Good job!! Since there is also a potential liability issue if you had an accident without brakes, this was a very good idea. Ford does make it easy. I changed my 2001 F150 from a 4 pin to to 4/7 pin. Easy plug and play. All the wiring was already there for a 7 pin.
Anyway, good job!!
P.S. You might want to check and see if the relay and fuse are in place in your fuse box for the "hot" wire that provides 12V to the trailer. For whatever reason, these are typically not installed at the factory. This allows you to charge the trailer battery while towing. If you have a 3-way fridg, it will also allow you to run the fridg with truck power while towing. Our pop-up had one of those and it was handy. Our Surveyor is only 2-way though so we have to use the propane while towing.
2012 F150 FX4 Ecoboost, 2016 Surveyor 274BHS
2003 Yamaha FJR1300, Demco Premiere Slider
1969 John Deere 1020, 1940 Ford 9N, 1948 Ford 8N
Jonsered 535, Can of WD-40, Duct Tape
Red Green coffee mugs