Galls ST300 - User Manual

Questions and Answers

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Chad SmithAug 15, 2025
How to troubleshoot a Galls ST300 with no power?
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  Joanne GomezAug 16, 2025
  If your Galls Amplifier has no power, check the following: * Ensure the connector is not loose. * Check if the 20A or 5A fuse is blown. * Verify there's no loose connection at the power source. Also, consider whether the back-lighting comes on, if you hear a “pop” when turned on, if the power is hooked up backwards, if it's a positive ground vehicle, if an external fuse or circuit breaker is used, and if the negative leads are connected to a good ground.
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Jonathan EricksonAug 21, 2025
Why is the horn or manual function stuck on my Galls ST300?
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  justin98Aug 21, 2025
  If the horn or manual function on your Galls Amplifier is stuck on, the issue might be: * A stuck siren push button switch: Check if the siren switch returns fully when released. * Improperly connected Aux Input: Verify the AUX Input is used and wired correctly. * Incorrectly set Aux Input Polarity Option: Ensure the AUX jumper option is configured properly.
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Andrew WhiteAug 25, 2025
Why does my Galls Amplifier siren tone cut in and out?
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  stewartdanielleAug 25, 2025
  If your Galls Amplifier has an intermittent siren tone, consider the following potential causes: * High or low voltage protection could be activated. * The microphone button might be activating unintentionally. * There could be a circuit breaker in the supply connection. * The speaker or speaker wire might be shorted. To troubleshoot, check if the vehicle voltage regulator is working properly, ensure the connector is tight on the back of the unit, verify there's no loose connection on the power lead, make sure nothing is lying on the microphone, use a circuit breaker with at least a 50A rating, and inspect the speaker for water damage or pinched wires. The input must be greater than 10V with the siren turned on.
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Charlene HahnAug 27, 2025
What causes a distorted siren sound in my Galls Amplifier?
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  Kim SmithAug 27, 2025
  If the siren sound from your Galls Amplifier is distorted, it could be due to: * A loose speaker assembly: Check if the speaker bell or tip is loose. * An intermittent Aux. Input connection: Verify the Aux. Input is used and wired properly. * Low or high vehicle voltage: Ensure the input voltage is between 10 and 16 volts while the siren is on.
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hfordAug 30, 2025
Why is there no or low radio sound from my Galls ST300 Amplifier?
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  pmarshAug 30, 2025
  If you're experiencing no or low radio volume with your Galls Amplifier, check these potential causes: * The unit may not be properly connected to the radio. Ensure the radio is correctly connected to the unit. * The radio volume might be too low. Try turning up the radio volume control. * The radio outputs may not be isolated, and the polarity might be hooked up backwards. Verify the radio wires are connected with the correct polarity from the radio output.
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Adam HuangSep 2, 2025
Why is my Galls ST300 playing the wrong siren tone?
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  Robin MasonSep 3, 2025
  If your Galls Amplifier has the wrong siren tone, it could be due to: * The Two-Tone option jumper being installed. Ensure the TT jumper option is properly configured. * The Aux. Input being set to the wrong function. Verify the AUX jumper option is configured properly.
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Courtney WilsonSep 5, 2025
How to fix a Galls Amplifier with no PA sound?
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  Bryan HardySep 5, 2025
  If you're not getting any PA sound from your Galls Amplifier, make sure the PA volume is set correctly by turning the PA volume control.
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Sharon SanchezSep 8, 2025
How do I fix a Galls Amplifier when the phaser is not working?
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  fpenaSep 8, 2025
  If the phaser is not working on your Galls Amplifier, ensure that the PD jumper option is configured properly, as the phaser might be disabled.
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Mrs. Alicia Chapman DVMSep 12, 2025
What to do if the lights on my Galls ST300 Amplifier are not working?
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  penny64Sep 12, 2025
  If the lights on your Galls Amplifier are not working, it could be due to an overloaded or short circuit. Check the fuse and wire connections.
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Victor Ball MDNov 17, 2025
What to do if the Galls Amplifier siren tone is not working?
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  ambernguyenNov 17, 2025
  If the siren tone on your Galls Amplifier isn't working, but the PA system is, or if there's no sound at all, consider these potential causes: * High or low voltage protection may be activated. The input voltage must be less than 16 VDC and greater than 10 VDC when the siren is on. * The microphone button might be stuck. * The Park Kill polarity option could be set incorrectly, or the Park Kill feature might be activated. * There could be a bad speaker or speaker wiring issue. To troubleshoot, check if the microphone button releases properly, ensure the PK jumper option is correctly configured, test if the siren works when the Park Kill input is disconnected, and see if either speaker diagnostic LED flashes (indicating a short) or if neither speaker LED turns on steady (indicatin...