Air Horn question..

Discussion in 'Trucks and Trailers' started by jbailey52, Feb 7, 2007.

  1. jbailey52

    jbailey52 LawnSite Bronze Member
    Posts: 1,057

    Ok since its cold out, I tend to find a lot of useless things to do with my time. Today I decided to try and install a air horn haha... Anyway the directions have it setup where you run the original factory horn wires to a new relay which a ground, the main 12v and a wire running to a switch, then to the new air horn is connected. Well I dont want the Airhorn to be used as my regular horn. So I bought a push button switch. So the spot on the relay where the existing horn was to go i left blank. Anyway when I Hooked it up, did not work. When I touched the empty spot (where existing horn should be) and the 12v slot with a piece of wire.. it went on... but on constantly regardless of the switch. Can someone help me with how to hook up this compressor, so that it will be activated by a switch? Thanks!
     
  2. hosejockey2002

    hosejockey2002 LawnSite Bronze Member
    Posts: 1,195

    You should run 12V power through the push button switch to the existing horn terminal on the air horn relay. The other terminal should go directly to 12V. A good place to tap power for the horn switch is the cold side of the horn fuse. Connect there, run through the your button switch and connect to the relay where the existing horn wire would normally hook up. That way if your wiring job shorts out for whatever reason it will blow the horn circuit fuse.
     
  3. jbailey52

    jbailey52 LawnSite Bronze Member
    Posts: 1,057

    But installing that way, wouldnt this horn operate when the original horn is pressed? Thanks for your help!
     
  4. Total.Lawn.Care

    Total.Lawn.Care LawnSite Senior Member
    Posts: 841

    Nope, it woudl look like this

    Fuse (cold side) ------------switch-----------Horn Relay

    This way, it takes the switch to send the power to the relay and activate the horn.
     

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