I hate to dig up an old thread but maybe what I did to mine will help…

I ordered factory fog light housings and a 880 fog light harness from Amazon. I pulled the main power from the battery and used the brown wire on the parking lamp to trigger the relay. The fog lights turn on every time the park lamps or head lights are on, an added bonus is that they say on with the high beams. Since my truck is a 1999 I have a diode between my white and gray wires on the BCM to disable my automatic headlights.