First, if it's night, you need to have your headlights on, even if it reduces visibility. That whole legal thing...that being said, there are some other threads on this topic, some in this forum and some in the general forum. The sum of it is: don't try it. The wiring to the factory fogs is really screwy. You can't cut the circuit anywhere because all the lights function on that circuit one way or another. The fogs' power runs through the headlamp relays and the headlamps can't function without the fogs on the circuit for some reason. I tried. If you want independent fogs, get some aftermarket PIAAs, Hella's or Pilots. They'll be much better lights, and you can run 'em whenever you want.