I moved my factory fog lights to brackets up by the windshield, and put 9" pencil beam driving lights on the bumper in the stock location. The driving lights give me long distance lights on the road, and the factory lights have a wide dispersion for night time trail running.
I wanted to use the stock fog light switch on the multi-function stalk, and be able to choose which lights to turn on (driving, fog, or both). I wired them per the diagram below. To make things easy, I used the power wire at one of the factory fog lights to feed power from the original turn signal switch to the two relays. I added two auxiliary switches inside to control the individual lights.
As you can see from the diagram, each set of lights gets power directly from the battery through a fuse and a relay using appropriately sized wire. To trigger the relays, the factory fog light switch supplies positive 12V, and the accessory switches supply the negative ground. If I only want the driving lights, I flip the accessory switch for them. Then I can use the factory switch to turn them on and off. If I want the fog lights, I flip that switch. If I want both, I flip both accessory switches. No matter what I choose, the factory fog light switch then is used to turn them on and off. This design can be used for any number of lights, you just need to add more relays and accessory switches. The accessory switches can be mounted anywhere you have room, they don't really need to be close to hand. Once you select which lights you want, you just use the factory switch to turn them on and off.
