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Extra Alarm Siren

m.c. Feb 28, 2011

  1. m.c.

    m.c. New Member

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    Extra alam siren
    Can you add a additional siren to the factory fitted siren.
    The factory fitted unit on my a4 cab is not loud enough, i bought an after market battery back up siren unit and wanted to know how or if you can add an extra unit without causing problems with the factory unit.
    The new unit only has 3 wires, positive, negative and trigger.
    Any help would be great[​IMG]
     
  2. vr6gordy

    vr6gordy Well-Known Member

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    you could wire air horns up if you want it super loud
     
  3. Woorlord

    Woorlord shifting to Hyperspace... . VCDS Map User

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    The Audi Siren uses 3 wires 1.=+12v, 2.=0v, 3.=Communications with Convenience module.
    You would need to break open the Audi Siren and find the trigger signal for the actual siren circuitry and then buffer that and feed it to your additional siren - not impossible but not the easiest of jobs.
     
  4. PetrolDave

    PetrolDave Well-Known Member

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    This question has been asked many times over the years, and AFAIK nobody has posted that they've achieved it.
     
  5. vr6gordy

    vr6gordy Well-Known Member

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    if its hard work to get wired why not buy a cheap aftermarket alarm and wire that in
     
  6. m.c.

    m.c. New Member

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    Cheers......................
     
  7. a4 cabrio

    a4 cabrio Member

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    could someone please tell me how to test the alarm to make sure all is ok with it
     
  8. aragorn

    aragorn "Stick a V8 in it!" Staff Member Moderator VCDS Map User

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    Move the siern to the engine bay.

    Will be much louder then, than being trapped in a tiny cubby hole in the corner of the interior.
     

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