Wolo 357 SERIES - User Manual

INSTALLATION INSTRUCTIONS
FOR 357 SERIES DISC HORN
Your purchase of a Wolo horn is a perfect choice for a new or replacement requirements. Wolo’s products are
manufactured with the finest materials. Each horn is tested to ensure 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 9AM to 4 PM EST by calling 1-888-550-HORN (4676).
IMPORTANT: This horn is available in different voltage ratings; before installing this horn make sure
the voltage rating matches the vehicles operating voltage and or horn system's voltage.
MOUNTING FIG. #1
1. Remove the factory horn, and install your new Wolo horn in
the same location. When possible face the horn downward
to prevent dirt and water from entering into the horn. Secure
the horn to the vehicle using the bracket and hardware
provided. NOTE: there are two different bracket mounting
holes that can be used, flat surface or 90 degree.
TWO (2) TERMINAL WIRING FIG. #2
(Replacement Installation, for vehicles that have an existing
horn system)
2. For vehicles where the factory horn wires are connected to
two (2) horn terminals, simply transfer the factory horn wires
to the new Wolo horn. Carefully inspect the horn wires
before connecting them to your new Wolo horn to ensure
that they are clean and free of dirt and corrosion. It doesn’t
make a difference which horn terminal is used on your new
Wolo horn when transferring the wires from your factory
horn. Make sure the horn’s screw terminals are securely
tightened. NOTE: If the horn you are replacing required wire terminals, they will not be required
and they will need to be removed from the horn wires. IMPORTANT: Always make sure that there
is an inline fuse used in the horn circuit to protect the vehicle, see chart on opposite side for
correct amperage, (fuse not included). The horn installation is complete and the horn is ready to
be used. Make sure wire are sure and safe.
ONE (1) TERMINAL WIRING FIG. #3
(Replacement Installation, for vehicles that have an existing
horn system)
3. For vehicles where the factory horn wire connects to only
one (1) horn terminal. Transfer the factory horn wire to
your new Wolo horn. It doesn’t make a difference which
horn terminal is use when transferring the wire from your
factory horn. If the horn you are replacing required a wire
terminal, it is not required and will need to be removed
from the horn wire. Carefully inspect the horn wire before
connecting it to your new Wolo horn so to ensure that it is
clean and free of dirt and corrosion.
4. The other horn terminal is connected to ground using any of the following locations; under the
horn’s mounting bolt if mounted on a metal body surface, under any clean metal body bolt or the
negative post of the battery. Always make sure the metal ground surface is free of paint, rust and
oxidation.
Fig. 1
5/16”
5/16”
Fig. 2
Fig. 3

Summary

Horn Mounting

Mounting Location and Method

Install the new Wolo horn in the same location as the factory horn, facing downward for protection. Use provided bracket.

Wiring with Existing Horn System

Two-Terminal Wiring

Transfer factory wires to the new horn's two terminals. Ensure wires are clean and terminals are tight. Remove old terminals if needed.

One-Terminal Wiring and Grounding

Connect the factory wire to one terminal. Ground the other terminal to a clean metal surface, bolt, or battery negative post.

Installation with New Horn Button Switch

Power, Switch, and Ground Connections

Connect horn to power source (with fuse), then to the horn switch, and the switch to ground on a clean metal surface.

Fuse Rating and Warranty

Voltage and Fuse Amperage Chart

Chart detailing correct fuse amperage for different vehicle voltage ratings (12V, 24V, 36V).

Manufacturer Warranty

Wolo's three-month warranty covers defects; excludes damage from neglect, abuse, or faulty installation.

Wolo 357 SERIES Specifications

General

Brand	Wolo
Model	357 SERIES
Category	Horn
Language	English