Specifications

A Signal Vehicle Products SS741MG electronic siren control head shall be provided and flush mounted
in the switch panel with a location specific to the customer’s needs. The siren shall feature 200-watt
output, “standby” mode awaiting instruction. The siren shall offer integrated public address, wail, yelp
air horn, phaser, manual control and simultaneous two-tone operation. A hard wired microphone with
noise canceling circuitry and Public Address override shall be provided with the siren head.
HORN BUTTON SELECTOR SWITCH
A rocker switch shall be installed in the switch panel between the driver and officer to allow control of
either the electric horn or the air horn from the steering wheel horn button. The electric horn shall
sound by default when the selector switch is in either position to meet FMCSA requirements.
AIR HORN ACTIVATION
The air horn activation shall be accomplished through the steering wheel button for the driver and by a
single right hand side lanyard cable accessible to the officer. An air horn activation circuit shall be
provided to the chassis harness pump panel harness connector.
MECHANICAL SIREN ACTIVATION
The mechanical siren shall be actuated by two (2) Linemaster model SP491-S81 foot switches mounted
in the front section of the cab for use by the driver and officer. A red momentary siren brake rocker
switch shall be provided in the switch panel on the dash.
The siren shall only be active when master warning switch is on to prevent accidental engagement.
BACK-UP ALARM
An ECCO model 575 backup alarm shall be installed at the rear of the chassis with an output level of
107 dB. The alarm shall automatically activate when the transmission is placed in reverse.
INSTRUMENTATION
An ergonomically designed instrument panel shall be provided. Each gauge shall be backlit with LED
lamps. Stepper motor movements shall drive all gauges. The instrumentation system shall be
multiplexed and shall receive ABS, engine, and transmission information over the J1939 data bus to
reduce redundant sensors and wiring.
The instrument panel shall contain the following gauges:
One (1) electronic speedometer shall be included. The primary scale on the speedometer shall read
from 0 to 100 MPH, and the secondary scale on the speedometer shall read from 0 to 160 KM/H.