One problem related to fog light switch has been reported for the 2004 Ford F-150. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2004 Ford F-150 based on all problems reported for the 2004 F-150.
Passenger side driving/fog light reflector looks rusted/ fast forward to July 9th, 2014 the whole reflector bracket is rusted sitting on the bottom of this lighting housing. Item was reported just after warranty period was over and item was never corrected with Ford. This housing was defective from the day I purchased this vehicle new.