Exact Answer: To replace a car horn, begin by disconnecting the negative battery terminal, then unscrew the old horn from its mounting bracket and unplug it from its wiring harness. Then install a new horn in reverse order, plugging it into the wiring harness and screwing it onto the mounting bracket. Finally, reconnect the negative battery terminal.
Replacing an old or broken car horn is not complicated but requires some basic automotive knowledge to ensure that you complete each step correctly and safely. Begin by ensuring your vehicle's engine is off and disconnecting the negative battery terminal to avoid any possible electrical shock or damage to other components while working on your vehicle's electrical system. Once that has been done, locate your existing car horn which should be mounted on a bracket near the front of your vehicle; use an appropriate sized wrench or socket set to loosen screws and detach it from its mount before unplugging it from its wiring harness connector. Now you can attach your new car horn using these same steps in reverse; first plugging in the new one’s wiring harness connector then secure it with screws onto its mounting bracket before finally reconnecting the negative battery terminal back onto your vehicle's battery post. With this procedure complete, you should now have successfully replaced your car’s old or damaged horn with a brand-new unit!