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The far left is the headlight switch...? The far right controls whether the headlights turn on automatically according to this old old thread...
http://www.expeditionforum.com/f16/autolamp-control-1042/
I don't mean to state the obvious, but if your fog lights are not working, try pulling the switch once you turn the headlights on. I guess I am confused in general by your question.
is there a write up on how to wire the fogs the the parking lights, my expo has fogs but the previous owner installed a headlight switch that does not have the fog light option.
I bought a separate relay harness (~$10 or so) so I dont mess with the factory harness. Its pretty simple - I just tapped on the passenger side corner lamp parklight as the trigger and voila. I figured I would always use the foglamps so its always on. Plus side is 1) foglamp stays on with highbeams and 2) and I can drive with the foglamps with headlights offis there a write up on how to wire the fogs the the parking lights, my expo has fogs but the previous owner installed a headlight switch that does not have the fog light option.