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Train Horns - Installation Instructions



When you first install the train horn system, turn on the air pump and only allow the air pressure to reach 80psi. Now, turn the pump off and allow it to cool down for 10-15 minutes. Now, you can turn the pump back on and allow it to finish filling the tank until it reaches its cut-off pressure of 120-135psi. After it turns off, allow it to cool down again for about 10 minutes. After this final cool down you can test the horn. Remember, the air pump is not designed for continuous usage. The air pump needs time to cool down between the horn blasts. If you plan on using the horn every couple of minutes, you need to seriously consider purchasing a heavy duty air pump. You can find them here at under Components.


Power from the toggle switch to your air pump should only be turned on after you have honked the horn a couple of times. The compressor does have an automatic shut off pressure switch, but should that switch fail or a leak arise, the pump will run continuously and will drain your battery or cause premature failure of your pump.

So remember to turn the toggle switch on, let the pump run until the pressure switch cycles off your pump, and then turn off the toggle switch. You will be able to tell when the air pressure is low and you need to turn on the compressor again.

All Kits require a Relay. Don't leave it out...

Relay Terminal numbers are on the bottom of the relay. You must unplug the connector to see the numbers.
Install the gauge with teflon paste or tape.
Relays, pressure switches, and inline fuses can be purchased separately.

Air Pump

Locations for air pumps should be out of the weather elements such as snow, rain or extreme heat such as under-the-hood engine temperatures.

Under or behind seats and/or in the tool box are great locations. Also, trunk or spare tire area will work well.

Air Tank

The air tank can be mounted anywhere you can fit your tank: Under your vehicle, in the bed of your vehicle, or inside your vehicle will work.

Horn Assembly

The horn is very durable; it can be located on top or under the vehicle, or under the hood.