have you checked the fuse in the junktion box under the hood?
Which fuse is dedicated cto the fog lights. There is not one labeled for the fog lights.
The Dodge Ram front fog lamp relay is located in the Power Distribution Center (PDC) in the engine compartment of the vehicle. The front fog lamp relay is a conventional International Standards Organization (ISO) micro relay (see below picture). Relays conforming to the ISO specifications have common physical dimensions, current capacities, terminal patterns, and terminal functions. The relay is contained within a small, rectangular, molded plastic housing and is connected to all of the required inputs and outputs by five integral male spade-type terminals that extend from the bottom of the relay base. The front fog lamp relay cannot be adjusted or repaired and, if faulty or damaged, the unit must be replaced.