universal tail lights

tring to replace the original lights because i had to take the bed off cause of rust i have parking lights,turn signals and hazards but no break lights heeeelp.

This is a strange one. The hazards and turn signals work, but no brake lights. They work on the same circuit. Does the truck have a factory hitch installed. If so, you may have blown the fuse to the brake lights doing the change over. They are in two places. One box is under the hood on the left fender and the other is at your left knee on the dash panel. Also, check your brake switch. Ford reversed the current flow through this switch in the last body change. You may have loosened the connector without knowing it.