How to Install an Air Horn


How to Install an Air Horn

Every time you press your car horn button, you’re embarrassed by your vehicle’s sad little horn. So, you’ve finally decided to do something about it, and you’re not messing around. You’re going straight to the big guns—an air horn.
Electric Horns


Electric Horns


The Different Types of Horns Available

An air horn is often referred to as a train horn because of its super loud sound. A true air horn is piped into a vehicle’s compressed air brake system and is controlled by a cord mounted onto the ceiling in the cab. More modern air horns use different horn relay wiring and are actuated by horn buttons, similar to your stock horn.

Before you run out and purchase a train horn kit, you should evaluate the pros and cons between the air horn vs. electric horn. There may be noise restrictions set by your state or city that limit your horn options, so you’ll want to check with your local DMV.

Novelty & Musical Horns


Novelty & Musical Horns


Air Horn Installation Steps

Once you decide to purchase an air horn, you’ll want to know how to install an air horn so that you can complete installation yourself. Although the installation will vary depending on the horn you select and your vehicle, these installation instructions will give you an idea of what the installation process entails.

Your air horn should include a compressor, a horn relay, tubing and two horns that each produce a different tone.

Step 1. Open the hood of your vehicle and choose a good place to mount the horns. You’ll want them mounted facing at a downward angle to prevent any water from collecting inside. You’ll also want them near the front of the vehicle.
Step 2. Using self-tapping screws and the provided mounting hardware, mount the horns to the vehicle.
Step 3. Mount the compressor to a fender or firewall with the appropriate hardware, and run the provided tubing from the compressor to the horns.
Step 4. Use a multimeter to locate and test the horn wire. The wire should read 0 volts at rest and 12 volts when the horn is pressed. Connect the horn wire to the relay along with power, ground and the 12-volt output to the compressor.
Step 5. Mount the compressor to the fender, firewall or somewhere free of water and excessive heat. Then, connect the negative terminal on the compressor to the ground. Finally, test the air horns by pressing the horn button. If installed correctly, the air horn and your factory horn will sound.
Product Comparison

Videos & Sounds

Trigger Horns™ Roach Coach™ 5 Trumpet La Cucaracha Air Horn Kit w/ Compressor


Trigger Horns™ V1 Buzz Bomb™ Vintage Air Raid Siren / Horn

Shop Popular Products




Shop for Air Horns

Shop Now


Previous articleTop 10 Jeep Wrangler Mods & Upgrades
Next articleWhat’s the Best Exhaust System for Optimized Fuel Economy?
Mike Cote
My 2015 Toyota Tacoma TRD Off Road Access Cab 4x4 offers bed space to camp in, haul my dirt bike around, and it's been done up to take on the trails. Favorite mods include my Icon coilovers to soak up the bumps. My Walker Evans 501 Legend wheels wrapped in Toyo RT tires give me the clearance from my upper control arms to fit (and they look darn good) and the over-sized tires take on rocks with plenty of traction. My Rigid Industries fog lights have kept me out of a ditch or two when night wheeling. Growing up going to car shows and helping my dad work on the family vehicles ignited my passion. My best memory was the first time I flushed the coolant. My dad forgot to tell me to keep my face out from under the drain plug. Never made that mistake again!


Please enter your comment!
Please enter your name here