Installation Guide: Maximus Train Horn Kits

Download Train Horn Kit Installation Instructions, PDF

Before Using for the First Time:

When you first install the train horn system, turn on the air pump and allow it to fill the tank until the pressure switch turns the pump off. Do not let it exceed 125psi. Now you can test your horn! Remember, the air compressor 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 very large air tank.

General Information:

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.

Relay Installation:

All Kits require a Relay. Relay Terminal numbers are on the bottom of the relay which correlate to the wiring diagram. You must unplug the connector to see the numbers.

Click Here to Open Wiring Diagram in New Tab
Wiring Diagram, Installation Guide

Toggle Switch:

The included Toggle switch is for the air pump and is to prevent draining of the automobile’s battery. Most Customers choose to utilize a “T” Crimp to hard wire the train horn to their existing horn. A second toggle or push button switch will be required if you prefer a separate button to activate the horn which is not included.

Air Pump Installation:

The Air Pump should be installed in a location that will not be subjected to the weather elements such as snow, rain or extreme heat such as heat within the engine compartment. Optimal installation locations are under or behind seats, in the trunk, in a tool box or spare tire area.

Pump Behind Seat Pump Under Seat

Air Tank Installation:

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. Note: In the event that you have a slight leak from the tank, DO NOT Tighten the gauge, fittings or pressure switch as this could strip the treading. Simply remove the leaking part and apply JBWeld to the threads. Tighten the leaking part just slightly past HAND TIGHTEN to ensure the threads do not strip. WARNING: Do not mount a plastic tank or plastic componants in close proximaty to exhaust and/or heat producing vehicle componants.

Tank Installation

Horn Assembly Installation:

The horn is very durable and can be located on top, under the vehicle or under the hood. After installing the horns on the vehicle, connect the 1/4 in. Poly tubing from the Solenoid to the tank. A quick connect 1/4 in. adapter was included in the hardware which replaces the exsisting 1/2 in. connector on the solenoid. NOTE: To prevent damage to the diaphragms caused by road debris, install the horns facing the rear, upward or to the side of the vehicle. This decreases the chance of debris collecting on the diaphragms.

Horn Under Vehicle Horn Installation, Under 2

Adjustable Pressure Switch:

NOTE: The center prong is removed by the manufacturer to prevent damage caused by not wiring correctly. Before adjusting the pressure switch, the air tank needs to be emptied. The 5/64 Hex Allen wrench is required to adjust the switch. Remove Plug from center of switch by unscrewing.

Pressure Switch Installation Guide Adjustable Pressue Switch

Maintenance:

If your horns begin to sound muffled and no air leaks can be found, you most likely need to clean your diaphragms. To do so, unscrew the back plates on each trumpet. Using a razor blade, gently cut the silicone sealing the back plate and remove the diaphragm taking care not to drop it. Gently clean the diaphragm with soap, water and a scouring pad. Reapply silicone and screw the backing plate and diaphragm onto each trumpet. Clean diaphragms once every 12 months to ensure sustained use.