User Manual — Vehicles

PACKAGE CONTENTS

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MotoHorn trumpet air horn
MotoHorn 12V compressor
Air line
User manual
Bolts and rubbers for mounting

MotoHorn works on any vehicle that has a 12V battery

SAFE INSTALLATION

  1. Follow this user manual.
  2. Power off your vehicle before the installation.
  3. Do not install MotoHorn directly to the stock horn wires, use 12 AWG wire.
  4. Avoid hard bends on the air line to provide free air flow.
  5. The air line can be extended without any loss of performance.
  6. Keep the compressor away from parts that produce a lot of heat.
  7. TIP: Install MotoHorn under the stock horn button and also keep your old horn for the best multi-tone effects.

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

MOUNTING THE HORN

We recommend checking our vehicle page review section for different mounting solutions. The most common mounting spots are the following: in the engine bay, behind the bumpers, behind the front grille.

Mounting examples:
Review Section →

The trumpet can be installed with the provided bolts and vibration damping rubbers.

MOUNTING THE COMPRESSOR

The compressor has a small bolting edge and can be bolted down to any available bolt. You can mount it close to the trumpet or extend the air line if necessary.

WIRING THE HORN

We recommend this wiring method for peak performance and to avoid electrical problems. Repeat the steps below if you wish to install multiple MotoHorns.

This wiring method also allows you to keep the stock horn for train-like multi-tones. You will need:

  1. Some 12 AWG wire.
  2. Some thinner 18-22 AWG wire.
  3. A 4 or 5 pin 12V relay switch, rated between 20 and 40 amperes.
  4. Some crimp spade terminal connectors for those wires, relay, and compressor pins.
  5. (Optional) 30A inline fuse.

A relay will look like this:

You can get these parts from any automotive store that sells electrical parts such as fuses and different wire gauges.

WIRING DIAGRAM

12 AWG WIRE IS THICKER WIRE
18-22 AWG WIRE IS THINNER WIRE

INSTALLING THE RELAY

We recommend keeping the relay closer to the battery and in a dry area.

Use 18 to 22 AWG wire:

  1. Connect pin 85 and 86 to your stock horn wires.
  2. The positive and negative can be switched up on these pins. Your relay is now operational.

We recommend keeping the relay closer to the battery and in a dry area.

Use 18 to 22 AWG wire:

  1. Connect pin 85 and 86 to your stock horn wires.
  2. The positive and negative can be switched up on these pins. Your relay is now operational.

FINAL CONNECTIONS

Use 12 AWG wire:

  1. Connect pin 30 to your battery positive. Optional: add 30A inline fuse on this wire.
  2. Connect pin 87 to your compressor positive.
  3. Connect the compressor negative to the battery negative.

If your relay has 5 pins, the pin 87a can remain unused.

You can upgrade this setup further by adding additional MotoHorns to your current setup.

(OPTIONAL) TOGGLE SWITCH

If you wish to toggle MotoHorn in or out of your stock horn button, a separate toggle switch can be added. Some pickup trucks also have auxiliary upfitter switches that can be used.

You would need to add this switch on one of the wires that goes from your stock horn to MotoHorn relay.

Use 18 to 22 AWG wire:

  1. Connect your switch to stock horn wire.
  2. Connect pin 85 or 86 to your new switch.
  3. Both negative or positive side can be used, it simply cuts one of those sides, making the relay and MotoHorn active only when desired.

Congratulations! Your MotoHorn is ready to use!

Need help? Email us:
support@motohorn.com

Need help? Email us:
support@motohorn.com