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Mechanical siren wiring

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  • Mechanical siren wiring

    We have an old federal mechanical siren that's been in the Chiefs office for the past 3 years waiting to get out on the truck and it's driving me crazy just seeing it sit there. Does anyone have experience with wiring these and does anyone know how to wire it to only come on with the air brakes off or the master warning on? The siren itself does not have a brake like the newer q2bs. I believe its a 66gh. If a q draws more power then I think we should wire it to withstand a q if we decide to upgrade from the oldie of we're not satisfied. We could hire someone to wire this for us but we have the tools and the people to get it done in house. If anyone has wiring diagrams I would love to see them or if anyone has any advice on what types of relays and to wire it through the master warning/air brakes. Thanks
    MY VIEWS DO NOT REFLECT those of my department or association.
    Originally posted by Rescue101
    I don't mind fire rolling over my head. I just don't like it rolling UNDER my a**.

  • #2
    You'll want to wire it through a good, heavy duty (starter) relay, direct from the battery (some circuit protection might be nice).

    That actually makes it easy - just wire the relay so it can't be energized unless the emergency lights are on - a simple tap off the light switch might work, or you might want another smaller relay so you're not pulling as much through the switch. So you pull the power for the hot side of the relay coil off the emergency light circuit, and run the ground side through a couple of foot switches.

    Without knowing your apparatus, I can't suggest anything on the brake side.

    Ran a Federal C in my POV for a while as chief (just because I could).


    • #3
      Look at the pdf for the switch kit.


      I would personally wire it through a starter solenoid.

      Your not gonna be happy with the 66. It doesn't need a brake as it does not have a clutch, so it doesn't free spin and wind down. It is direct drive off the motor so it will either be winding up or winding down, no coasting.

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      Comments made are my own. They do not represent the official position or opinion of the Fire Department or the City for which I am employed. In fact, they are normally exactly the opposite.


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