Hey I just installed aftermarket fogs and originally just wired the switch to the battery but I kept forgetting them on. So I ended up wiring it to the marker light wire which doubles as turn signals, you just need to check which one is which. If I remember correctly I spliced into a yellow wire. There is 3-just strip them and troubleshoot. Now even if I forget the fogs on they turn off with the car as the markers do. Hope this helps a bit even tho you probably have a factory switch. I think if you disconnect the factory switch and hook up a separate relay system to power them and switch on-you can do it this way. Might be a little excessive though..This also involves removing the bumper and sliding out the headlight too, which is real easy once you do it, now I just put back enough plugs and bolts to hold it in place so I can always remove the bumper easy as i am constantly adding things underneath. CheerrsWhat about a BCM hack? Desolder and switch the fog with the parking light switch input wire(s)?