I know this probably was asked but the search button did not produce the results I want. I just ordered the OEM fog light switch for my PIAA 510 fog lights that have been installed for a while now. I was wondering how to wire the switch up to the PIAA harness. The switch from PIAA has three wires (Power to the switch, signal to the relay, and a ground). Now I am assuming since everyone else has done it that the method PIAA uses (connecting power to relay) would work with the OEM switch (connecting to ground). I can't think of a reason that would be a problem. What I want to know is the wiring for the OEM switch. What I've gathered is the bottom two are for the illumination (very bottom goes to ground, 2nd up comes from other light source?) Then the top two are for the switch, and probably doesn't matter the order. So for this set up, could I have the power come in from the harness and go to the middle two (providing illumination and the signal for the switch), the top post go back to the relay, and the bottom go to ground? It makes sense to me but I have everything working now with the PIAA switch and really want to get the OEM switch in there and STILL have everything work.