Street Thunder™

ST240
SIREN
Installation and Operating Instructions

NOTICE
Due to continuous product improvements, we must reserve the right to change any
specifications and information contained in this manual at any time without notice. Galls
and/or the manufacturer make no warranty of any kind with regard to this manual, including,
but not limited to, the implied warranties of merchantability and fitness for a particular purpose.
Galls and/or the manufacturer shall not be liable for errors contained herein or for incidental or
consequential damages in connection with the furnishing, performance, or use of this manual.

1340 Russell Cave Road / P.O. Box 54308 Lexington, KY 40505

Tel: (800) 477-7766 Fax: (800) 944-2557
www.galls.com
PLITSTR312 REV. D 10/28/13

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 Installation Information

MODEL: ST240 Serial #:

PURCHASE DATE:
INSTALLATION DATE:
INSTALLER:
DEALER:
Model and serial number located on bottom of unit

TABLE OF CONTENTS
GENERAL DESCRIPTION 1
INSTALLATION NOTES 1
MOUNTING TIPS 1
ELECTRICAL CONNECTIONS 2-3
Wiring Guide 2
Wiring Diagram 2
Mandatory Connections 3
Optional Connections 3
INSTALLER SELECTABLE OPTIONS 4-5
DIP Switch Settings (AUX & P/K Polarity) 4
Optional Tone Programming 4-5
OPERATION 6-7
Power/PA 6
Selector Switch 6
Manual/Horn Button 7
Radio Volume 7
Microphone 7
Auxiliary Input 7
Park-Kill Cutout 7
TROUBLESHOOTING 8
Speaker Diagnostics 8
Troubleshooting Chart 8
SPECIFICATIONS 9
SERVICE 9-10
Parts 9
Warranty 10

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 General Description
The ST240 Siren Amplifier is a premium 200W unit designed for dual 100W speaker
use. The primary operating modes are Thunder, Yelp, Wail, Hands Free, Manual, PA,
and Radio. A Noise Canceling PA Override and push-button Horn Override are
available in all modes. A manual push-button is provided for push-on/push-off tone
toggle operation in the Thunder, Yelp, and Wail modes. It also allows manual siren
control in the Manual or PA modes. Any siren tone can be re-programmed to a
more desired tone. Another feature allows cycling through Wail, Yelp, Thunder, and
Standby by providing a signal to the horn ring auxiliary wire when the function switch
is in the Hands Free (HF) position. A Park Kill option is provided for connection to a
door switch, etc. to disable the siren when exiting the vehicle. Radio and PA volume
controls are provided on the front panel. The front panel is backlighted with LED's
for night visibility. This compact unit utilizes short circuit, high voltage, low voltage,
and reverse polarity protection systems for maximum service life.

Installation Notes
Proper installation of the unit is essential for years of safe, reliable operation. Please
read all instruction before installing the unit. Failure to follow these instructions can
cause serious damage to the unit or vehicle and may void warranties.
Qualifications - The installer must have a firm knowledge of basic electricity, vehicle
electrical systems and emergency equipment.
Keep These Instructions - Keep these instructions in the vehicle or other safe place
for future reference. Advise the vehicle operator of the location.
Unpacking - Inspect contents for shipping damage. If found, alert carrier
immediately. Contents should include unit with microphone, mounting bracket w/
hardware, microphone bracket with 2 screws, wiring connector, and these
instructions. Contact your supplier immediately if any components are missing.

Mounting Tips
• Mount in a location with adequate ventilation to prevent overheating.
• Devices should be mounted only in locations listed in SAE standard J1849.
• Controls should be placed within convenient reach of the driver.
• Assure clearances before drilling in vehicle.
• Sound levels produced by attached speakers can cause permanent hearing loss.
• Never operate this unit without adequate hearing protection for you and others
in the area. (OSHA 1910.95)
• Consider wire routing and access to connections.
• Install mounting bracket to vehicle using 1/4" hardware (not supplied).

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 Electrical Connections
Wire Size and Termination
Electrical connections to this unit are made through the green 12-terminal
connector located in the rear of the unit (See below - Part # CPSS-153).
Examine the charts below to determine the proper gauge of the wire to use. Please
review the following recommendations when making your electrical connections:
• For safety and reliability we highly recommend that you always use both Power
terminals (1 & 2) and both Ground terminals (3 & 4).
• Use only high quality crimp connectors. Make sure all connections are tight.
• Minimize the number of splices to reduce voltage drop.
• Route wiring to prevent wear, overheating, and interference with air bag
deployment.
• Use grommets and sealant when passing through compartment walls.
• Ground connections should be made directly to the negative of the vehicle
battery. Where not possible, only connect to substantial chassis components.
• Install and check all wiring before connection to vehicle battery.
• CAUTION: All wires should be rated for at least 125% of their maximum current
load. All wires connected to the positive terminal of the battery should be fused
at the battery for their rated load.
• Review the charts below that indicate the recommended wire gauge, based
upon the length of the wire run and the current that will pass through the wire.

WIRING GUIDE CPSS-153

Typical Typical (Please note that this is an upside-down view)
Terminal Description
Color Current
1 Power Red 10A 20A
2 Power Red 10A Total
3 Ground Black 10A 20A
4 Ground Black 10A Total
5 Speaker 1 Brown 4A
6 Speaker 2 Brown 4A RECOMMENDED WIRE GAUGE
7 AUX In Green 3A
Current 10' 20' 25'
8 AUX Out Orange 3A < 2.0A 22 AWG 18 AWG 18 AWG
9 Radio Repeat Blue 0.1A 2.0-4.0A 18 AWG 16 AWG 16 AWG
10 Radio Repeat Blue 0.1A 4.1-5.5A 18 AWG 16 AWG 14 AWG
11 Backlighting Yellow 0.1A 5.6-8.0A 16 AWG 14 AWG 14 AWG
12 Park/Kill Input White 0.1A 8.1-12.0A 16 AWG 12 AWG 12 AWG
(Please note that this diagram references the connector with the siren UPSIDE-DOWN)

Factory Factory Horn

BATTERY
Ignition Switch

Horn
Backlighting Power

+ - Relay
12V
AUX POLARITY

PK POLARITY
Cut Factory Wire

20A
Fuse
+ OR

2 Way
AUX OUT

Park Kill

Radio POS
Ground

AUX In

Speaker
Power

-
SS700

NEG

1 2 3 4 5 6 7 8 9 10 11 12 TONE
SELECT
WARNING: ENSURE CONNECTOR IS FULLY INSERTED & SCREWS LOCKED
(SIREN TOP)

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 (Electrical Connections CONT’D)
CPSS-153
For ease of installation, you can remove (Please note that this is an upside-down view)
the green connector from the siren while
connecting your wires. Please note that
when referencing terminal numbers using
the wiring diagram on the previous page,
the siren should be held upside down so
the screw heads face UP, as pictured to
the right.
Connections to the terminal block are summarized both in the chart and in the
wiring diagram on the previous page. For more detailed information, review the
section below.

Mandatory Electrical Connections

Ground - Connect terminals 3 & 4 to the negative terminal of the battery.
(You MUST connect both of these terminals!!)
Power - Connect terminals 1 & 2 to a 10-16VDC ignition switched power source
capable of supplying 20A. Be sure to use minimum size #14 AWG wire.
(You MUST connect both of these terminals!!)
Speaker - Connect terminals 5 and 6 to your siren speaker.
(You MUST connect both of these terminals!!)

OPTIONAL ELECTRICAL CONNECTIONS

AUX IN/OUT - These terminals are typically connected to the steering wheel
horn relay. They allow for several functions including siren
operation in HF mode (see page 6), Air Horn activation, or
Manual “step up” function (see page 5).
If you will be using any of these features, cut the wire that
connects the horn relay to the horn. Connect the side from the
relay to terminal 7. Connect the side from the horn to terminal 8.
Review the wiring diagram above and ensure that you have the
AUX Polarity DIP switch set for the correct polarity (see page 4).
(You MUST connect both of these terminals as described
above for proper operation of your vehicle horn!!)
Radio Repeat - If you would like the ability to re-broadcast your two-way radio
over your siren speaker, connect terminals 9 & 10 to the two-way
radio speaker or output connector of the two-way radio.
Backlighting - Connect terminal 11 to the dash lights, ignition switched power,
or other switched 10-16VDC power source. This controls the
backlighting for the face of the siren.
Park/Kill Feature - If you would like the siren to automatically disengage when the
vehicle door is opened or when the vehicle is placed into park,
connect terminal 12 to the dome light, added door switch, or
added park switch. Review the wiring diagram on the previous
page and ensure that you have the PK Polarity DIP switch set for
the correct polarity (see next page).

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 Installer Selectable Options
The ST240 has several options that can be selected prior to installation by using
either the two DIP switches located on the
back of the unit, or by using the “tone
programming” button on the back in
combination with the knob and/or buttons on
the front of the unit. These options should be
set before installing the siren in the vehicle.

DIP Switch Settings:

Auxiliary AND Park-Kill Input Polarity
The Auxiliary input (terminal #7) and Park Kill input (terminal #12) are normally
activated by applying a positive voltage to each wire. If you would like to activate
either function by connecting to ground (negative) instead, use the DIP switches
located on the back of the siren.
The default setting for both switches (Positive Switching) NEG

POLARITY
is such that the DIP switches are flipped AWAY from the

POLARITY
AUX
P/K
closest edge of the siren (i.e. DOWN in the picture to
the right). To have either function activated when the POS
input is grounded, flip the corresponding switch in the
opposite direction (TOWARDS the edge of the siren/UP).

Optional Tone Programming

The ST240 will produce 7 different tones/sounds by activating its various functions:
Function Default Tone
Thunder Step Up (THUNDER+MAN)Two-Tone
THUNDER Thunder
YELP Yelp
WAIL Wail
MANUAL Ramp Up
HORN Air Horn
AUX Air Horn
Each of these functions can be reprogrammed for a different tone, if desired. To
change the sounds for any of the functions, proceed below.
1. Power the unit up.
2. Activate the function you wish to change.
• To change the tone for the THUNDER, WAIL, and YELP functions, rotate the
selector knob into the corresponding position.
• For the MANUAL, HORN, or AUX functions, rotate the selector knob into
the MANUAL or PA position, then press and hold the MANUAL button,
HORN button, or steering wheel horn, respectively.
• For the Thunder Step Up function, rotate the knob into the THUNDER
position, then press and release the MANUAL button.
Tone Program Button
The tone currently programmed for that function will sound.
3. The Tone Program button can be found above the DIP
switches on the rear of the siren. Using a paper clip, press and
release it to cycle through the list of optional tones. Review
the chart on the following page for a list of optional tones.
4. De-activate the function to save the new tone.

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 (Installer Selectable Options CONT’D)

Optional Tones
Tones For WAIL, YELP, and
Tones For MANUAL Button & AUX Wire Tones for HORN Button
THUNDER, and Thunder Step-Up
Function 1 STANDARD AIR HORN (AUX default) 1 STANDARD AIR HORN (default)
1 WAIL (Wail default) §, *, † 2 LOW FREQUENCY AIR HORN 2 LOW FREQUENCY AIR HORN
2 YELP (Yelp default) §, * 3 RAPID AIR HORN 3 RAPID AIR HORN
3 THUNDER (THUNDER default) 4 AIR HORN II 4 AIR HORN II
TWO-TONE (THUNDER Step Up
4 default) 5 DOUBLE POST POP AIR HORN 5 DOUBLE POST POP AIR HORN
5 MECHANICAL WAIL (FIRE ENGINE) † 6 SINGLE AIR HORN 6 SINGLE AIR HORN
7 SINGLE QUICK AIR HORN 7 SINGLE QUICK AIR HORN
6 MAX YELP §, *
8 TWO TONE AIR HORN 8 TWO TONE AIR HORN
7 HOOT
9 MANUAL (MANUAL default) *
8 RAPID HOOT
10 MECHANICAL MANUAL (FIRE ENGINE)
9 AIR HORN & YELP
10 GHOST
11 RAPID GHOST ►►►► System Reset ◄◄◄◄
12 SINGLE AIR HORN
If you would like to reset ALL of the siren programming
13 SINGLE QUICK
options to their defaults, activate any tone and press
14 DOUBLE POST POP AIR HORN
the Program button for nine (9) seconds. The LED will
15 TWO TONE AIR HORN
flash once, then twice, then three times, and all siren
16 STANDARD AIR HORN
tones will stop.
17 CONTINUOUS TONE
18 CONTINUOUS BEEP
§ = SAE approved
* = California Title 13 approved
† = See below
Wind Down or Hard Stop Option
By default, the Wail tones indicated by the “†” above will “wind down” when they
are de-activated. If you prefer to have them immediately stop (i.e. hard stop), hold
the Program Button for 3 seconds (until the LED flashes once). This will change it to a
hard stop. Repeat to change back to the wind down option.

Tone Disable Option

Some municipalities may ban the use of specific tones, such as the Thunder tone.
The Thunder Disable jumper option (found in our previous versions of the ST240) has
been replaced with the Optional Tone Programming feature described on the
previous page. This will allow you to reprogram the THUNDER default tone from
Thunder to any of the other tones listed. This new feature expands the former option
(that was previously limited only to disabling the Thunder tone) to the ability to
replacing ANY of the tones that may not be permitted (or desired).

Auxiliary-Manual Function Option

By default, when the siren is in THUNDER, YELP, or WAIL modes, and the AUX function
is activated (typically by the steering wheel horn relay), the siren will produce the
standard Air Horn Tone (#1 in the chart above) and temporarily override the siren
tone. If you would rather have the AUX function (i.e. steering wheel horn) mimic the
MANUAL button (see MANUAL button functions on page 7), then you should
program the AUX function for tone #9 (Manual) or #10 (Mechanical Manual).

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 Operation

General
This unit is designed for easy operation under the stress associated with high-speed
pursuit. Most siren functions are accessible with one simple motion without repetitive
activation of switches or automatic timed switching that can interfere with desired
operation.

Power/PA Knob
The Power/PA knob is located in the upper right hand corner of
the front face. It has two functions:
ON/OFF - This knob turns the siren on and off. While in
the OFF position none of the siren functions
will work. The position of this knob does NOT
affect the siren backlighting.
PA Volume Control - This knob also provides you the ability to adjust the public
address volume. It should be set when the vehicle is parked.
Typically you should set the PA volume to the maximum
possible level with no feedback (squeal).

Selector Switch
The rotary selector switch controls the primary operating function of the siren.
THUNDER - Ultra-fast changing tone used for maximum attention.
YELP - A rapidly changing tone used in congested areas.
WAIL - A slower changing tone used on highways.
HF - Hands Free - A silent standby mode also known as Horn Ring Cycler.
Allows the user to cycle through the tones programmed for the WAIL,
YELP, THUNDER, and OFF by repeatedly pressing the horn or other switch
connected to the AUX input. Changing the rotary knob to any other
mode will resume normal siren operation.
MANUAL - A silent standby mode that allows push-button Manual, push-button Horn,
and Public Address operation. The siren output winds down when the
MANUAL button is released.
PA - A silent standby mode that allows push-button Manual, push-button Horn
and Public Address operation. The siren output terminates immediately
when the MANUAL button is released.
RADIO - Also known as Radio Repeat, this function amplifies a radio speaker input
for re-broadcast outside the vehicle. The PA remains functional, but no
siren tones are available in this position.

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 (Operation CONT’D)

The front panel of the ST240 contains a two-way

momentary switch for the Manual function and
the Air Horn.

MANUAL
Rotary Switch
Position Function When MANUAL Pressed
MANUAL or HF Produces a rising siren tone while being pressed. The siren
output “winds down” when the MANUAL button is released.
PA Also produces a rising tone, but the siren output immediately
stops when the button is released.
THUNDER/YELP/WAIL The MANUAL button will “step” the siren up to the next button’s
programmed tone:
(WAIL
YELP
THUNDER
Thunder Step Up)
These quicker tones are used to momentarily alert motorists at
intersections and very highly congested areas. Pressing the
MANUAL button once changes to the next faster tone. Pressing
the MANUAL button again, reverts the siren back to the original
tone.

HORN
Pressing the HORN button provides a simulated air-horn tone while pressed. This can
be used to either replace or to supplement the normal vehicle horn and is useful at
intersections. This tone will override all other siren tones. See pages 4-5 for
programming optional Air Horn tones.
Radio Volume
The radio repeat volume (VOL.) control is recessed in the upper
left hand corner of the front face. This should be set when the
vehicle is parked. First set the volume level of the vehicle's two-
way radio to its normal operating volume. Adjust the siren's
rotary selector switch into the RADIO position. Insert a small, flat
blade screwdriver into the VOL. adjustment port. Turn in a
clockwise direction to increase the sound level.

Microphone
The attached microphone is used for public address
operation and overrides any siren tone when its
push-to-talk (button on the side) is pressed.

Auxiliary Input
An auxiliary input may be connected to the vehicle horn ring or other switching
device (see page 3). It provides the same operation as pressing the HORN button or
can be programmed to function like the MANUAL button (see page 5).

Park-Kill Cutout
During installation, the Park-Kill input may be connected to a door switch (see page
3). This feature will automatically turn off any siren tone when the door is opened.
The siren tone will remain off even if the door is closed. Changing any switch or
input will restore normal functioning of the siren tones.

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 Troubleshooting
Speaker Diagnostics
There is a diagnostic LED shaped like a speaker located in the upper right hand
corner of the front panel. This LED will only turn on while a tone is trying to be
generated. It can be used to help identify the siren/speaker status.

Steady - Speaker is connected and operating properly.

Single Flash - Standby Mode
Double Flash - Short/Over Current
Triple Flash - Park-Kill Activated
Quad Flash - Improper Voltage (too high or low)
Off - No speaker is connected, or
- The siren is Off, or
- The speaker or wire connection has come loose or is electrically
open

This unit is designed to provide years of reliable service under even the worst
conditions. Many times there may appear to be a problem with the unit when the
true problem is in the speaker(s) or improper installation. The following chart shows
typical symptoms and possible causes.
Symptom Possible Cause Check
No power Connector loose Check connector
Siren 20A fuse blown Is power hooked up backwards? Positive ground vehicle?
Is an external fuse or circuit breaker used?
Loose connection at power source Are the negative leads connected to a good ground?
No siren tone - PA High voltage protection The input voltage must be less than 16 volts.
works Low voltage protection The input must be greater than 10V with the siren turned on.
Microphone button stuck Does microphone button release properly?
Park Kill polarity option set wrong Is the PK jumper option properly configured?
Park Kill activated Does the siren work when Park Kill input is disconnected?
No siren tone - No Bad speaker or speaker wiring Check for a short.
sound Check for an open.
No PA PA volume not set properly Have you tried turning the PA volume control?
Distorted siren sound Speaker assembly loose Is the speaker bell or tip loose?
Intermittent Aux. Input connection Is the Aux. Input connected properly to horn relay?
Low or high vehicle voltage Input voltage must be between 10 & 16 volts while siren is on and
drawing full current.
Intermittent siren tone High voltage protection Is the vehicle voltage regulator working properly?
Low voltage protection Is the connector tight on the back of the unit? Is there a loose
connection on a power lead? The input must be greater than
10V with the siren on and drawing full current.
Microphone button activation Is something lying on the microphone?
Circuit breaker in supply connection Is a circuit breaker used with at least a 50A rating?
Shorted speaker or speaker wire Does the speaker have water damage, or is a wire pinched?
Horn function or Manual or Horn push buttons stuck Does the switch return fully when released?
Manual or Thunder Aux. Input improperly connected Is the Aux. Input used and wired properly?
stuck on Aux. Input Polarity Option set wrong Is the AUX polarity jumper option properly configured?
No Radio Unit not connected to radio Is the radio connected properly to the unit?
Radio volume too low Can you hear the radio in the vehicle?
Adjust the Radio volume control
Wrong siren tone Siren tones programmed incorrectly? Re-program tones/Use System Reset (page 5)

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 Specifications
Input Voltage 10 - 16 VDC (negative ground)
Input Current 8.0 Amps @ 13.6 VDC (single 100W speaker)
16 Amps @ 13.6 VDC (dual 100W speakers)
Standby Current Switch Off/Backlighting Off - Less than 4 mA
Switch On/Backlighting Off - Less than 7 mA
Switch Off/Backlighting On - Less than 40 mA
Switch On/Backlighting On - ≈ 44 mA
Audio Frequency 200Hz - 10 kHz + 3db
Output Power 105 WATTS RMS MAX. (15.0 VDC - single 100W speaker)
200 WATTS RMS MAX. (15.0 VDC - dual 100W speakers)
Siren Frequency 675Hz - 1633Hz
High Voltage Protection 16 - 18 VDC will cause siren output to cease, resumes at normal voltage
Short Circuit Current 50 AMPS (supply circuit must be capable of supplying this)
Operating Temperature -22° F to +140°F
Diagnostic Indicator LED indicator provides diagnostic feedback
Connections Detachable 12-terminal connector
Size 6" Wide x 4.5" Deep x 2-1/2" High
Shipping Weight 6 lbs.

Service

Parts
Part Description
S30161-18 Siren Top Extrusion
P30234-11-1P Siren Bottom Mounting Plate
SWH-152 Optional Wiring Harness
P30069-38 Microphone Bracket with Screws
P30056-16 1/4-20 x 3/8" Hex Locking Bolt
P30028-23 20 Amp Automotive Fuse
P30232-1 Noise Cancelling Microphone
P30208-10 Microphone Strain Relief
P30032-8 TIP36CPowerTransistor
S30239-11 Rotary Selector Switch Knob
P30147-44 Mounting Bracket
P30052-40 Case Screws

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 Limited Warranty
Galls warrants this new product to be free from defects in material and workmanship, under
normal use and service, for a period of five (5) years from the date of delivery to the first user-
purchaser.
During this warranty period the obligation of Galls is limited to repairing or replacing, as Galls
may elect, any part or parts of such product which after examination by Galls is determined to be
defective in material and/or workmanship.
This warranty does not cover labor charges for removal or re-installation of the product. Fuses
and lamps are not covered under this warranty.
This warranty does not extend to any unit that has been subjected to abuse, misuse, improper
installation, or which has not been adequately maintained, nor to units which have problems
related to service or modification at any facility other than the manufacturer.
THERE ARE NO OTHER WARRANTIES, EXPRESSED OR IMPLIED, INCLUDING BUT NOT
LIMITED TO, ANY IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A
PARTICULAR PURPOSE. IN NO EVENT SHALL GALLS BE LIABLE FOR ANY LOSS OF
PROFITS OR ANY INDIRECT OR CONSEQUENTIAL DAMAGES ARISING OUT OF ANY SUCH
DEFECT IN MATERIALS OR WORKMANSHIP.

No Hassle Guarantee
Providing quality products to professionals who
protect and serve the public is our core purpose.
If you aren’t satisfied with a newly purchased item, simply return
it to us so we can repair it, replace it or refund your money.

To Return Merchandise…
Within the first 60 Days:
Please contact Galls Customer Service Department at (800) 477-7766.
After 60 Days:
Please contact the manufacturer at (585) 226-9025.

If you have any questions concerning this or any other Galls product, please
contact our Customer Service Department at (800) 477-7766.

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