I have an 07 F250. I have the factory tow package and have been towing a 14ft trailer. I noticed the other day that the blinkers were blinking faster than usual. Checked all the lights and everything worked except for the truck brake and blinkers. Trailer lights worked fine other than a faster than usual blink. Dropped the trailer and when I checked the truck lights I found that: -rear brake lights didn't work
-rear turn signals didn't work
-rear flasher didn't work
-rear driving lights worked as did the license plate light
***All lights in the front worked***

Checked: All fuses under steering wheel and under the hood.
Contacts in the trailer jack.
Contacts in the steering column(possible pulled wire from tilt wheel)
Grounds to the frame in the rear

Brake switch should be ok since the trailer brake lights work right?
Flasher should be ok since the truck front and trailer blinkers and 4 ways work also right?
Been researching this for a few days. I wanna drop this trailer but I cant until the truck rear lights are resolved. Any help would be greatly appreciated.

 

Changed the bulbs and everything is fine....cheapest fix first