Specifications

Figure 3-7. Horn Ring Connections.
-7-
a. Locate the wire that connects the
vehicle horn ring switch to the horn or horn relay.
Cut this wire.
b. See figure 3-7. Splice the white/
yellow power cable wire to the horn ring side of the
wire that was cut in step a. Insulate the splice with
the wire nuts (supplied).
CAUTION
The horn ring transfer circuit of the siren is
capable of switching a maximum of 2-amperes.
Some vehicles do not have a horn relay and,
consequently, will draw more than 2-amperes
when the vehicle horn is activated. Consult
your vehicle service manual or a qualified
mechanic to determine the current required
to activate the horn. If it is less than
2-amperes, perform the procedure in step c.
If it is greater than 2-amperes, perform
steps d through j.
c. Splice the white power cable wire
to the horn side of the cut wire. Insulate the splice
with a wire nut.
d. Obtain a SPST relay of sufficient
contact current capacity to activate the vehicle horn.
Refer to figure 3-7 while performing the following
steps.
e. Mount the relay in a suitable
location.
f. Connect the horn side of the wire
cut in step a to the relay contact terminal.
g. Determine the “sense” of the
vehicle’s horn ring activation circuit, i.e., does the
horn circuit require a switched positive voltage or
switched ground for activation.
h. Connect the switched relay
contact terminal to the positive or negative potential
determined in step g.
i. Connect the white power cable
wire to one end of the relay coil.
j. Connect the other end of the relay
coil to the opposite potential of that connected to the
switched relay contact terminal in step h.
4. Park-Siren Deactivator.
IMPORTANT
It is the installer’s responsibility to determine
an appropriate location in the vehicle circuitry
to connect the pursuit wire.
This feature uses the pursuit wire to
automatically deactivate siren tones when the vehicle
is shifted into PARK.
See figure 3-6. To use this feature,
connect the power cable’s gray wire to a vehicle
circuit that is grounded when the vehicle is shifted
into PARK.
5. Pursuit Switch.
NOTE
When the Model SS2000SM is shipped from
the factory, the pursuit function is NOT ACTI-
VATED. The Operation and Configuration
Instructions (Part No. 255283) describes the
procedure for activating the pursuit function.
Either the pursuit function or the park-siren
deactivator function must be selected. Both
functions are not available at the same time.
The SS2000SM Pursuit function is
activated by momentarily grounding the Pursuit
switch input using a user-supplied momentary
switch (Federal Part Numbers 122A108 and
164B101) or other equivalent momentary contact
SPST switch.
a Install the pursuit switch in a
location which allows the vehicle, controls, and
microphone to be operated safely at all times. In
addition, the pursuit switch should be installed in a
location which allows minimum reaction time in an
emergency situation.
b. Connect one side of the switch to
a RELIABLE chassis ground using #18AWG or
larger wire.
c. See figure 3-6. Connect the other
side of the switch to the power cable’s gray wire using
#18AWG or larger wire.
6. Common Microphone.
a. If the PA and RADIO transmitter
are to share a common microphone, the audio switch-
ing must be performed by a user-supplied switching
device. The violet wire provides +12VDC when the
SS2000SM is operating in the PA mode.
290A4023-09
VEHICLE HORNS
STEERING COLUMN
TO BATTERY
RELAY (USER SUPPLIED)
CUT WIRE
SW
TO HORN, OR HORN RELAY
CONTROL CABLE ASSEMBLY
WHT
WHT/YEL
TO HORN SWITCH