forget about the switch. The switch works like this. You turn the foglight switch on, and the fogs will come on when the headlights are on. That is assuming you install the fogs into the harnesses that are built into your bumper.
I recommend cutting the harnesses and splicing them into the parking lights. When you have you parking lights on(which you can have on seperately OR run them with the headlights), they will be on. Good for daytime running-worked perfect for me.
They fit but you have to cut the perforated sectionin the bumper. ON the back of it there are little lines that show what to cut.