There are two methods of wiring your train horn: 1) Simple version: direct connection to the battery and an external button/switch. 2) Advanced version: connection to the stock steering wheel button with a relay.
What is included in the box? Single Metal Trumpet 12V Electric Compressor Air Tube Setup kit (screws and brackets)
Horn Specifications: Trumpet Length: 17.7 inch / 45 cm Trumpet Diameter: 3.75 inch / 9.5 cm 12V voltage 20A current Material: Chrome plated metal
Before installing the train horn:
Make sure your engine is turned off for safety purposes.
To minimize voltage and efficiency loss, make sure the wiring and air tube are as short as possible.
Make sure that to use wiring that supports 15-20 amps.
Make sure the air tube is not bent or blocked when installed.
Do not install the system near hot areas as it affects the performance.
Installing the train horn:
Choose the location for the horn installation. (keep in mind that the size is 17.7” by 3.75”) and screw it tightly so it doesn’t fall when driving.
Install the compressor as close as you can to the horn to reduce efficiency loss.
Connect the air tube between the compressor and the horn.
Do the wiring, we have two methods below:
Wiring Method 1 (Simple version): This is the simplest configuration, it’s direct connection to a battery and an external button/switch (15-20 amps)
Wire the “+” side of the battery to the button/switch with a 20-40 amps fuse on the wire for safety reasons.
Wire the other side of the button/switch to the “+” side of the compressor.
Wire the “-” side of the compressor to the “-” side of the battery.
Wiring Method 2 (Advanced version): This version is a little bit more complicated, it’s connection to the stock steering wheel button and it involves a relay. Relays are universal and have the same number labels.
Using a 12-gauge wiring, wire the “+” side of the battery to the “30” marked side of the relay with a 20-40 amps fuse on the wire for safety reasons.
Connect with a 12 gauge wire the “85” side of the relay to the “-” side of the battery or from the vehicle chassis.
Find your stock horn button wiring and connect the positive to pin “86” on the relay.
Connect using 12 gauge wire the “+” side of the compressor to relay pin “87”.
Connect using 12 gauge wire the “-” side of the compressor to the “-” side of the battery or to ground from vehicle chassis.
Congratulations! You successfully installed your train horn.
Here is a YouTube video that explains relays and its connections very well: This video is not ours.
Installing multiple train horns: If you have bought more than 2 horns and want to bring out the multi tone to your vehicle, we suggest using method 2 wiring. It is very important to use thicker wiring and we recommend 2 horns maximum per relay.
Items to upgrade from ‘Wiring Method 2’ when installing 2+ horns:
Upgrade your relay to 40A or higher because each compressor needs 15-20A.
Upgrade the 12-gauge wiring to a thinker 9-gauge wire.
Upgrade the 20-40A fuse to 40-60A fuse.
You can still use 18-gauge (or smaller) wiring for your switch/button.
It’s best to find a dual 87 relay pin when installing 2 horns, that way you it’s easier to connect each compressor to a separate 87 pin.
If you’re installing 3+ train horns, you will need a secondary relay. You will need to do the wiring again for the additional relays, and you can connect them to the same switch/button. This way you can have as many train horns as you want!