-15-
(Service CONT’D)
Troubleshooting
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
On/Off PA Vol. Not ON
Yellow wire is not powered
Connector loose
Siren 20A fuse blown
Loose connection at power
source
Be sure the On/Off PA Vol. Knob is not in the OFF position
Is yellow wire connected to switched +12VDC?
Check connector
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?
No siren tone -
PA works
No siren tone -
No sound
High voltage protection
Low voltage protection
Microphone button stuck
Park Kill polarity option set wrong
Park Kill activated
Bad speaker or speaker wiring
The input voltage must be less than 16 volts.
The input must be greater than 10V with the siren 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 the PA Vol. In ON and turned up
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
Intermittent Aux. Input connection
Low or high vehicle voltage
Is the speaker bell or tip loose?
Is the Aux. Input used and wired properly?
Input voltage must be between 10-16 volts while siren is on.
Intermittent
siren tone
High voltage protection
Low voltage protection
Microphone button activation
Circuit breaker in supply
connection
Shorted speaker or speaker wire
Is the vehicle voltage regulator working properly?
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 turned on.
Is something lying on the microphone?
Is a circuit breaker used with at least a 50A rating?
Does the speaker have water damage, or is a wire
pinched?
Horn function
or
Manual or
Thunder stuck
on
Manual/Horn rocker switch stuck
Aux. Input improperly connected
Aux. Input Polarity Option set
wrong
Does the switch return fully when released?
Is the Aux. Input used and wired properly?
Is the AUX jumper option properly configured?
No Radio
No or Low
Radio
Unit not connected to radio
Radio volume too low
Radio outputs not isolated and/or
polarity hooked up backwards
Is the radio connected properly to the unit?
Can you hear the radio in the vehicle?
Have you tried turning the Radio volume control?
Are the radio wires connected to the correct polarity from
the radio output?
Wrong siren
tone
Two-Tone option jumper installed
Aux. Input set to wrong function
Is the TT jumper option properly configured?
Is the AUX jumper option configured properly?
Thunder not
working
Thunder disabled
Is the TD jumper option configured properly?
One light
output not
working
Internal 20A fuse blown
Check the output fuses inside the unit.
