If you understand the mechanics of the car, then that's great. You don't need a "wiring harness" that's already in your car. Definitely one if not the easiest mod I've made for my beloved 4runner. Unscrew the factory horn, connect the factory wiring harness to positive and add a ground wire (which easily threads onto the screw you just removed), screw on the cool new horns and you're done! That's easy.
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