-9- -2-
TROUBLESHOOTING
Symptom
Possible Cause Check
Power source not turned on
Connector loose
Amplifier 15A fuse blown
Loose connection at power
source
Is ignition switch in AUX or ON position?
Do you hear a “pop” when turned on?
Is power hooked up backwards? Positive
ground vehicle?
Is an external fuse or circuit breaker used?
Are the negative leads connected to a good
ground?
tone
High voltage protection
Bad speaker or speaker wiring
Input voltage must be less than 16 volts.
Check for a short or an open in the output.
Distorted
siren sound
Speaker assembly loose
Intermittent Aux. Input
connection
High vehicle voltage
Is the speaker bell or tip loose?
Is the Aux. Input used and wired properly?
Input voltage must be less than 16 volts.
siren tone
High voltage protection
Circuit breaker in supply
Bad Connection
Shorted speaker or speaker wire
Is the vehicle voltage regulator working
properly?
Is a circuit breaker used with at least a 30A
rating?
Is the connector tight on the back of the
unit?
Does the speaker have water damage, or is
a wire pinched?
Horn
function or
Manual
function
stuck on
Horn switch stuck
Manual push-button switch
stuck
Aux. Input improperly
connected
Aux. Horn Input Polarity
reversed
Does the horn switch return fully when
released?
Does the Manual push-button switch
fully when released?
Is the AUX Input used and wired properly?
Is the AUX horn wire wired for correct
polarity?
Wrong
siren tone
Two-Tone option jumper
installed
Aux. Horn Input Polarity
reversed
Is the TT jumper option properly
configured?
Is the AUX horn wire wired for correct
polarity?
working
Thunder disabled Is the TD jumper option configured
properly?
INSTALLATION
Proper installation of the unit is essential for years of safe, reliable operation.
Please read all instructions 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 any damage is found, alert the carrier
immediately. ST105 contents should include: an amplifier box with wiring
pigtail, a "U" bracket for mounting, and these instructions. Please contact Galls
immediately if any components are missing.
INSTALLER-SELECTABLE OPTIONS
The ST105 has Thunder disable, Two-Tone enable, and Auxiliary Horn Polarity
options that can be selected during installation. An internal jumper on the printed
circuit board inside the amplifier case allows the installer to select these options.
These options should be set before installation of the unit.
Amplifier Cover Removal
Remove the four Philip
head screws located on the
back of the amplifier unit.
Carefully slide the cover off
of the extrusion.
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