Bad idea to tap into the headlight wire. Run separate wires for sure and a switch. Wouldn't want to overload the circuit. When doing electrical work I run new circuits whenever possible. Especially for cosmetic type accessories.fog lights are one of the easiest mods to do to a car as long as you're ok with wiring. only things you need wire, drill, screws, and a relay. you can even do without the relay if you want to wire a separate switch to it. its a lot easier to just tap into your headlights wire though.
What size bulb comes in the factory fogs? The dealer had to order mine and when they install them, I want to give them different bulbs to put in.The cool thing about installing the Scion factory fog light kit is that the switch mounts in the center shifter console and there is a small illuminated icon on the dash display that lights up to let you know they are on.
In my tC, you had to install the wiring harness. It was pretty simple with the exception of where the ground wire was supposed to attach. It was hard to see without taking the fender liner completely out but I got it done. I am not positive, but it may be the same situation. I'm letting the dealer install them this time.I had some questions concerning fogs.
1. Someone mentioned the factory kit having a dash light. I'm guessing that means there is already a fuse set aside for fog lights and when it's active this is how the led turns on? If that's the case, which fuse is this so that we can tap into it with any fog installation?
2. Since there is an after market kit, is the wiring already in place hanging off the light harness or does the kit introduce the additional wiring?