I wired the = switch to a relay that takes power from the alternator/battery through a 30 amp = fuse. The relay gets power from the "G" single connectors on the = back of the fuse panel. This is 12Vdc switched by the ignition.

I wired the = fog lights on an independent circuit so that if the head lights failed, I would = have an alternate light source. This setup has saved me on a trip through = the Ozark mountains. The switch for the headlights failed. I was = on a winding mountain road, when suddenly it went black. I switched on = the fog lights and was able to get to the next town and make temporary repairs = to the headlights. Wiring into a circuit switch off by the ignition will = prevent battery run down from leaving the fog lights on.

I have also = wired the head lights through a relay to prevent another failure of the headlight switch. The headlight switch is wired through the OEM fuses and = switches the relay. The relay draws power from the = alternator/battery.