I'm trying to wire up fog lights on my 04 Ranger that doesn't have any fog lights. I already searched and the truck doesn't have any fog light harness on it. I'm going to run the wires into the factory power distribution block and run a relay in the stock location. I'm looking at the factory relays and there are 5 pins. I'm just wondering what pin #4 is for. The rest make sense but what is that one for? thanks