The powerful sound of an air horn is a part of many different automotive and industrial systems, from emergency vehicles to semi-trucks. But to achieve that loud and powerful sound requires a bit of electrical know-how, so if you find yourself wanting to install an air horn, it’s important to understand how to wire the relay that will power it.
Relays are electrical switches that allow a low current circuit to turn on and off a higher current circuit, and in this case, the current needed to power the air horn. Understanding how to properly wire the relay is a key step in adding an air horn to your vehicle. With a few simple steps, you’ll be ready to enjoy the loud, proud sound of your new air horn.
To install an air horn you will need a relay, a wire harness, a 12V power source, a switch and some basic tools. The first step is to identify the terminals on your relay. Most relays have five terminals, labeled 85, 86, 87, 30 and 87A. Terminal 85 is the input side of the relay and terminal 86 is the output side. The 30 terminal is the power source for the relay, and the 87 and 87A terminals connect to the air horn itself.
Next you’ll need to connect the power source to the relay. This is done by connecting the 12V power source to the 30 terminal. You can use either a fused connection or a soldered connection, depending on your preference. Once the power source is connected, you can then connect the switch to the 85 terminal. The switch will be what turns the air horn on and off, so make sure it is connected securely.
Once you’ve connected the power source and switch to the relay, you’re ready to connect the air horn itself. Connect the 87 and 87A terminals to the air horn. Make sure the connections are secure, as any loose wires could cause a short circuit. After connecting the air horn, you can then test it to make sure the system is working correctly. Check for any loose connections and make sure the air horn sounds when the switch is activated.
Finally, you’ll want to secure the relay in place. This can be done with a few screws, ensuring that the relay is firmly mounted and won’t come loose. Once the relay is in place, your air horn should be ready to go.
Wireing a relay for an air horn may seem intimidating, but with a few simple steps, you can enjoy the loud, proud sound of your new air horn. Understanding the basics of how a relay works and how it needs to be wired is key to installing an air horn correctly. So if you decide to give it a try, make sure you take your time and double check all your connections.
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