MOTO HORN MH-3.0 Vehicles User Manual

Table of Contents

Repeat the wiring steps to add additional MotoHorns

Follow this user manual.
Power off your vehicle before the installation.
Do not install MotoHorn directly to the stock horn wires, use 12 AWG wire.
Wire connectors are heat shrinkable, do not use open flame near your vehicle.
Avoid hard bends on the airline to provide free airflow.
Keep the compressor away from parts that produce a lot of heat.
TIP: Keep your stock horn connected to its wires when wiring MotoHorn. This way both horns get activated at once.

You can do so by splicing the wires or adding a Y-split to the stock wire ends.

If you follow the next steps, no mechanical or electrical knowledge is required

Weak stock horn? Get Dual Track:
Motohorn.com/dual.

See mounting examples online:
Motohorn.com/trainhorn-manual.

The most common mounting spots are the following: in the engine bay, behind the grille, behind the bumpers, or attached to the hood.

Optional:
Attach the trumpet to the plate and use its center holes for mounting.

For example: using the stock horn bolt as the mounting point, or attaching the plate to any suitable bolt on your vehicle.
Use the provided bolts and vibration-damping rubbers.

The compressor has a small bolting edge and can be bolted down to any available bolt on your vehicle.
You can mount it close to the trumpet or extend the air line without any loss of performance, if necessary.
To increase the compressor’s lifespan, we recommend mounting it in a dry spot.

12 AWG WIRE IS THICKER WIRE
18 AWO WIRE IS THINNER WIRE

Crimp the connectors tightly and use a heat gun or a lighter to shrink them around the wire. Don’t use open flame near your vehicle.

We recommend keeping the relay closer to the battery and in a dry area. Relay pins are numbered.

Use red connectors and 18 AWG wires:

The relay has a green 30A built-in fuse, make sure it is seated properly.

Use yellow connectors and 12 AWG wires:

Connect pin 30 to the battery positive.
Connect pin 87 to compressor positive.
Connect the compressor negative to the battery negative, or ground it to the frame.

Congratulations! Your
MotoHorn is ready to use!

Need help? Email us:
support@motohorn.com.

HORN WIRING

TIP: Keep your stock horn connected to its wires. This way both horns get activated at once for the best multi-tone effects.
You can do so by splicing the wires or adding a Y-split to the stock wire ends.

MOTOHORN COMPRESSOR

OPTIONAL TOGGLE SWITCH

Connect MotoHorn to your system when desired, using some 18-22 AWG wire and a toggle switch.
Install the switch on one of the wires linking your stock horn wire to the MotoHorn relay.

MOTOHORN RELAY Pin 85 OR 86