easy just run a wire from the positive of the drl to a relay and then to the fog lights, power it directly from the battery and you wont cause any problems with other systems, the relay will shut off the fog lights when the drl goes out, fuse the power wire from the battery for safety. that's the way I have my hid's setup. All you need is a multimeter to check which wire is positive on the drl and fog lights. the relay will have it's own ground point.