The truck probably has a separate fuse for the dead lights. My 2007 ford did and the new 2014 does too.
In April the trailer's drivers side lights went out I did everything listed above, then took the time (and a new pair of cheaters) to read the teensy print on the truck fuse box diagram to figure out which of the 300 grain-of-rice sized fuses was blown. Of course no retail parts dealer has the new fuses, so a trip to the dealership added to the fun. Bought me 5 new fuses. Cause you know if you only buy one, the other blows right away. If you buy too many you never need them. I marked the new fuse so I know where to start looking if it ever blows again.
