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-3- 

(Electrical Connections CONT’D)

 

For ease of installation, you can remove 
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)

CPSS-153 

(Please note that this is an upside-down view)

 

Summary of Contents for Street Thunder ST240

Page 1: ...944 2557 www galls com 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 an...

Page 2: ...NECTIONS 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 OPERAT...

Page 3: ...ears 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 Qual...

Page 4: ...o 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 th...

Page 5: ...n 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...

Page 6: ...lectable Options 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 Thunde...

Page 7: ...y 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...

Page 8: ...ols 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 hig...

Page 9: ...way momentary switch for the Manual function and the Air Horn 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...

Page 10: ...turned on Does microphone button release properly Is the PK jumper option properly configured Does the siren work when Park Kill input is disconnected Check for a short Check for an open No PA PA vol...

Page 11: ...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...

Page 12: ...aser 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...

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