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Page 5 of 6 Now that we've installed the fog lights between the bumper and the frame, we have to wire them up. There are several options. First, you could wire them to any of the lights already present in the front with a relay. Second, you could utilize the fog light relay and fuse that are already in the fuse box under the hood. Thirdly, you could pull wires through the firewall.The first option is definitely the easiest. All you have to do is add a T-tap to the correct wire, in our case we connected the fog light control to the (+) low beam. Then connect this T-tap to the coil on the relay and ground the other side. At this point you would need power for the fog lights which will be switched by the relay that was just described. The fuse box under the hood has a simple spot where you can simply add a ring with a wire to connect to battery (+). In this wire I suggest you add fuses. We used a 20amp fuse. Now the second wire you need is ground. You could connect this to the frame or the battery itself. Make sure that you can get a good contact and always test the ground after you install it with a multi-meter. This method allows you to have the fog lights automatically come on with the low beams The second option is a bit harder, however this would allow you to make it look more stock. You can solder on the bottom of the fuse box the wiring for the fog lights, everything should be present except for the wiring harness to the fog lights. After you've connected the fog lights to the fuse box you have several options for how to control them. At the BCM you could connect the fog light relay control with the low beam relay control, this would essentially work the same as method one, except you connect the low beams and fog lights at the BCM. The other option is that you buy the stock headlight switch with fog light control. This will not work straight out of the box, to have it work completely OEM the dealership has to reprogram the BCM so that it will interpret the fog light signal and switch the fog light relay control accordingly. However, one could just cut the fog light relay control @ the BCM and T-tap it to the fog light control signal. This way the BCM does not have to be reprogrammed, plus the fog lights will then not turn off when you turn your high beams on. If you do want your fog lights to turn off when your high beams turn on, just add a relay and connect the relay's coil to the high beam relay control The third option is very similar to the first option, except instead of using a light signal, we pull 1 or 2 wires through the firewall and put a switch behind it, this will look the least OEM of them all. You can however, get the OEM light switch with fog light control and wire the fog light signal to a relay to control them behind the dash and pull the wires for this through the firewall. This would work the same as the second option, this way you don't have to mess with the wiring at the BCM. However, this way you do have to pull 1 or 2 wires through the firewall. We wired the fog lights to the low beams as described in the first option. Here is a quick overview / diagram of how we need to wire it up: 
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