ok, i found this on a wed site that i dont remember, i hope this helps. :-]
OK, locate the Parking light relay. Its under the dash, in the drivers footwell, up inside slightly to the left. With your head down there, turn the parking lights on and off and locate it from the clicking. Once you locate it, find the red wire with the black stripe. Thats the relays output wire. You will want to tap into this wire for power. Dont cut it, just remove the insulation for 3/8-1/2" and solder another 24" or so long wire to it. Insulate it with some electrical tape.
Now, Cut the FAT red wire going into the fog light switch. Insulate the exposed end coming up from the dash. Strip the wire going into the switch and solder the wire running from the parking light relay to this wire. Use electrcal tape or shrink tubing on this connection.
Thats it. Put the lower dash back together, which is the easiest way to get to the fog light switch. The fogs will now work when the parking lights are on, and they wil automatically turn off when the parking lights are turned off. That makes sure that you´ll never leave them on.
Doing this took me about 20 minutes. Its EXTREMELY easy to do.
RECOMMENDED FOR ANY EGT OWNER. This can be done to any Ford car with the BS fog light setup. The wire colors will be different of course on ther cars.