Connecting The Air Horn To 12V Battery & Horn Switch
Before outlining the electrical wiring instruction, first please be aware of the two types of
horn switches.
Connecting to the Vehicle’s Factory Horn Switch
1. There are two types of horn switches: one with a single terminal and the other twin terminal.
2. Single Terminal Horn Switch: If a vehicle's factory horn has one terminal, simply transfer wire
from the compressor’s positive to the relay and connect the compressor's negative terminal
to the ground. The grounded connection must be free of rust or paint.
3. Twin Terminal Horn Switch: If a vehicle's factory horn has two terminals, simply transfer the
wires from the horn switch terminals to the bottom of the compressor. Please note: when
testing the horns, if the compressor motor turns on but the horn does not sound, reverse the
wires connected at the bottom of the compressor.
IMPORTANT: Please refer to your vehicle handbook to locate where the horn switch is in
your vehicle and identify the type of horn switch you have in your vehicle.
Electrical Wiring Guidelines
When attempting to connect all the electrical wiring and installing the relay, please do so in a dry
location. See instructions below for connecting the electrical wiring and refer to Figure 4. Please
note: the instructions below refers vehicle’s with a single terminal horn switch (see previous
section).
IMPORTANT: In order to do the electrical wiring, you would need 1.5mm 16-gauge
electrical wiring of at least 5 metres in length, a soldering iron and solder wire. All these
items are not included with this product. The soldering iron and solder wire will be used
to connect & secure the wires to the terminals.
1. Before mounting the relay, you will need to connect all the wiring to the relay. First, connect
relay terminal 87 to the positive terminal of the compressor. Solder the wires to the terminal.
Connect the negative terminal of the compressor to the ground (body of the vehicle).
2. Then connect relay terminal 85 to the terminal of the horn switch.
3. Using the 16-gauge wire, connect both the relay terminal 30 and relay terminal 86 together.
