I put some nice PIAA 85w fog lights on our '94 Bronco. They are wired in the "normal" manner - fog light switch gets power from the low beam circuit, fog light relay connected to the battery - but I would like them to be able to come on with the parking lights as well and still turn off when switching to high beams. On the newer F150s the fogs work in just this way. The fog light relay grounds through the positive side of the headlight circuit so when the highs are off, the relay gets ground through the high filament, but no ground when the highs are on. So my question is, is there any reason I couldn't get this to work on my Bronco?

 

You could try it. You will have to move the power source for the fog switch from the lowbeam circuit to the running lights circuit(brown wire).

 

Works perfectly. Just installed some PIAA driving lights as well.