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Positive or Negative Air Horn
Activation
– The green wire
allows activation of the Air Horn
by an external source. This
input is usually wired into the
vehicle horn ring switch. The
wiring diagram on
page 7
shows
two connection examples.
NOTE:
Permanent
disconnection of the vehicle horn
is NOT recommended.
The unit is factory shipped with the horn option (AUX) defaulted to activation by
applying a positive voltage to the wire (your vehicle horn sw12VDC). To
activate the Air Horn by connecting to ground or negative (your horn is Ground-side
switched), move the "AUX" option jumper from the "POS" pins to the "NEG" pins.
(See diagram above).
Air Horn Tone
– This unit comes with the option to change the Air Horn Tone to
an alternate “flatter” tone. If you wish to change the tone, remove the “TONE”
jumper from the OPTIONS jumper pins. (See diagram above).
Light Control or Radio Repeat
–
This unit has a button on the microphone that can
be used to activate your warning lights (up to 20
amps) or it can be used to broadcast the two-way
radio over your P.A. speaker. The unit is shipped
with the defaulted option being Light Control. If
you wish to use the button on your microphone to
instead activate the Radio Repeat Function, remove
the “RAD” jumper from the OPTIONS jumper pins
and connect your radio’s speaker wires to the two
blue wires from this unit.
Radio Repeat Volume Control –
If you are using the Radio Repeat
Function, please note the location
of the volume control
potentiometer inside the case
(pictured to the right). The
volume level is pre-set at the
factory, but it may need to be
initially adjusted with a small
screwdriver after the siren has
been installed. The Radio Repeat
level will vary based upon the
input levels of the signal from
your radio. Once this is set upon
installation, in most cases it will
not need further adjustments.
AUX OPTIONS
JUMPERS
