Wolo MCHWK-2 User Manual

MODEL MCHWK-2

Air Horn Wiring Kit

Kit Is Designed For An Easy Hook-Up T o The Vehicle’ s Factory

Horn System For any 12-Volt Motorcycle, Car or Truck

INSTALLATION INSTRUCTIONS

Your purchase of a Wolo air horn wiring kit is a perfect choice for an easy and professional installation of any direct drive
air horn (no air tank) to the vehicle’s factory horn system. Wolo’s products are manufactured with the finest materials.
Each wiring kit is tested to insure it meets all manufacturing specifications, before it is packaged.
If you need help installing this product, our technicians are available to answer your questions,
Monday through Friday from 9 AM to 4 PM ESTby calling 1-888-550-HORN (4676).

MOUNTING RELAY Fig. #1

(Relay is not included in kit)

1. The relay that was provided with your horn needs to be mounted in a dry location with the
terminals facing downward.

2. Use the relay’s mounting bracket as a template, mark the hole location and drill to size 1/8”.

3. Secure the relay to the mounting location using the sheet metal screw provided.

CONNECT PLUG TO RELAY Fig. #2

4. Connect the wiring kit’s square female plug to the relay. NOTE: The plug can only mate with
the relay in one position.

TWO WIRE FACTORYHORN SYSTEM Fig. #3-5

If your factory horn has two separate wires connected to it, follow instructions below starting at
number 5. If your factory horn has one wire connected to it proceed to step number 11.

5. GRAY WIRE: Remove the wires that are connected to your factory horn. Then using the
insulated butt connector provided, you will connect one of the gray wires from the wiring kit’s
plug to one of the factory horn wires. Note: It does not make a difference which factory horn
wire connects to the plug’s gray wire. The terminal on the factory horn wire will need to be
removed. Strip back the wires’plastic insulation so that 1/4” of wire is exposed and insert the
factory horn wire and one of the gray wires fully into the butt connector.
Crimp the connector and make sure that both wires are securely held in the
connector by lightly pulling on each wire while holding the butt connector. See
Fig. #3 & 4

6. GRAY WIRE: Using the insulated butt connector provided, connect the other
gray wire from the wiring kit plug, to the other factory horn wire. Follow the
same procedure as step #5.

7. RED WIRE with inline fuse: Is connected to POSITIVE (+) 12-volts such as the
battery, alternator and etc. See Fig. #5

8. RED WIRE without inline fuse: Is connected to the compressor terminal marked positive or (+). Cut
the red wire to length and strip back the plastic insulation so that 1/4” of wire is exposed. Insert the wire
into the 1/4” female push-on terminal and crimp terminal. Make sure
that the wire is securely held in the terminal by lightly pulling on the
wire while holding the terminal. Connect the terminal to compressor’s
(+) male terminal. See Fig. #5

9. BLACK WIRE: Is connected to the compressors (-) terminal and the
other end of the wire will be connected to ground such as the negative (-) battery post or any clean body bolt.. Cut the

Fig. 1

Fig. 2

Fig. 3

Fig. 4

VEHICLE’S FACTORY

HORN WIRE

1/8” hole

Relay not included

black wire to length and strip back the plastic
insulation so that 1/4” of wire is exposed. Insert the
wire into the spade terminal and crimp terminal.
Make sure that the wire is securely held in the
terminal by lightly pulling on the wire while holding
the terminal. Secure the spade terminal to (-) ground.
NOTE: IMPORTANT: Make sure that any paint or
rust is cleaned from bolt and metal surface that will
be in contact with the terminal. (Sheet metal screw
provided if needed.) See Fig. #5

10. Secure all wires using the plastic wire ties provided
to ensure that no wire touches the engine, exhaust
manifold or any moving engine parts. Installation is
complete.

ONE WIRE FACTORYHORN SYSTEM Fig. #6-8

If your factory horn has one wire connected to it proceed to step number 11.

11. GRAYWIRE: Remove the wire that is connected to your factory horn The
terminal on the factory horn wire needs to be removed. Strip back the plastic
insulation of the horn’s wire so that 1/4” of wire is exposed. Insert the factory
horn wire and one of the gray wires from the wiring kit plug, fully into the butt
connector. Crimp the butt connector and make sure that both wires are securely held in
the connector by lightly pulling on each wire while holding the butt connector. See Fig. #6
& 7

12. GRAY WIRE: The other gray wire is connected to (-) ground, such as the negative (-) battery post or
any clean metal body bolt. Cut the gray wire to length and strip back
the plastic insulation so that 1/4” of wire is exposed. Insert the wire
into the spade terminal and crimp terminal. Make sure that the wire
is securely held in the terminal by lightly pulling on the wire while
holding the terminal. Secure the spade terminal to (-) ground
NOTE: IMPORTANT: Make sure that any paint or rust is cleaned from bolt and metal surface that will be in contact
with the terminal. (Sheet metal screw provided if needed.) See Fig. #8

13. RED WIRE with inline fuse: Is connected to POSITIVE (+) 12-volts such the battery, alternator and etc. (Sheet
metal screw provided if needed.) See Fig. #8

14. RED WIRE without inline fuse: Is connected to the compressor terminal marked positive or (+). Cut the red wire to
length and strip back the plastic insulation so that
1/4” of wire is exposed. Insert the wire into the
1/4” female push-on terminal and crimp terminal.
Make sure that the wire is securely held in the
terminal by lightly pulling on the wire while
holding the terminal. Connect the terminal to
compressor’s (+) male terminal. See Fig. #8

15. BLACK WIRE: Is connected to the compressors
(-) terminal and the other end of the wire will be
connected to ground,such as the negative (-)
battery post or any clean metal body bolt. Cut the
black wire to length and strip back the plastic
insulation so that 1/4”of wire is exposed. Insert
the wire into the spade terminal and crimp
terminal. Make sure that the wire is securely held in the terminal by lightly pulling on the wire while holding the
terminal. Secure the spade terminal to (-) ground,. NOTE: IMPORTANT: Make sure any paint or rust is cleaned from
bolt and metal surface that will be in contact with the terminal. (Sheet metal screw provided if needed.) See Fig. #8

16. Secure all wires using the plastic wire ties provided so to ensure that no wire touches the engine, exhaust manifold or
any moving engine parts. Installation is complete.

Fig. 5

Fig. 6

Fig. 7

Fig. 8

VEHICLE’S FACTORY

GRAY

HORN WIRE