I got ya man, did the same to mine. You want to be able to turn your fog lights off or on regardless of if your headlights are on or off. Ford set them up in a way that if you have your high beams on your fog's turn off. You can only use them when your headlights are on and low beam. Here's the write up I used.
Mustangworld Fog light re-wire
Btw's there's lots of good stuff in there.
awesome...im about to do this too. this will be much easier than the way i was thinking..
95 GT- AFR 185's, Comp CAM, Trick FLow TH upper and lower, 30lb injec, 76MM C&L kit, Full MSD, BBK Pulleys, 3:73, BBK Long Tubes, X Pipe, Magnaflow Cat back, Cobra front control arms, MM CC plates LCA's and Panhard bar, tuned by Adam @ Pops Racing.