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how do you wire a horn?

Discussion in 'Technical Chat' started by MurphyZ, Apr 15, 2010.

  1. Apr 15, 2010 at 5:01 PM
    #1
    MurphyZ

    MurphyZ [OP] Well-Known Member

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    I HATE SPICYTACOS
    Alaska
    Vehicle:
    97 4runner, 08 Tundy
    89 SAS 3.4 1st gen 4runner- Sold 3.4 swap cut hood for clearance exhaust x-over and magnaflow muffler lockright in the rear SAS 83 toy axle (Wab-Fab) 4xinnovations sliders roof rack from 2nd gen for kayak.
    i am trying to add an electric air horn to my tacoma and i cant get the relay wiring correct.

    i want it to be seperate from my factory horn completely.
    how do you to it

    87 is the switch
    30 is power with fuse
    85 ground
    86 horn
    ground the horn neg side.

    sound right?

    relay terminals-
    85
    86
    87
    30
     
  2. Apr 16, 2010 at 6:04 PM
    #2
    Rocketball

    Rocketball If The World Didn't Suck, We'd All Fall Off

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    Pioneer head unit, PAC steering wheel control modual, Hard wired Sirius radio, Hard wired radar detector, Hella Supertone horns, Blacked out badges, Smoked Tails, BHLM (color matched Speedway Blue), T-Rex Eyelids, Black Powder Coated Billet Grill, Color Matched Engine Cover, Lund in channel vent visors, FJ Cruiser wheels, Leer 100XQ shell, OEM bed mat, Piezo beeper for locking doors, Tinted front side windows, Black Westin bull bar, Aires tube steps, Mini Maglite Mod, D-Cell Maglite Mod, Weathertech Digifit Floor Mats
    If you bought the air horn hit that has the small compressor and 3-2 plastic trumpets, the wiring is simple.

    You may want to disconnect the battery before starting.

    Here's the kit I used:

    http://cgi.ebay.com/ebaymotors/Dual...ptZMotorsQ5fCarQ5fTruckQ5fPartsQ5fAccessories

    1. Disconnect the factory horns from the wiring harness.

    2. Mount the new horns and compressor where you want them. Point the horns downward towards the ground so they don't accumulate water inside.

    3. Using a crimp on spade connector and the correct lenght of wire, crimp the spade connector to the wire, then insert the spade connector into the wiring harness where the factory horns connected, and connect the wire to the positive terminal on the compressor.

    4. Run a ground wire from the compressor's negative terminal to a good grounding point under the hood.

    That is all you should need to do.

    I've been using this setup for almost a year and not blown any fuses.
     
  3. Apr 24, 2010 at 10:24 PM
    #3
    joes06tacoma

    joes06tacoma Well-Known Member

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    You have a couple of those relay terminals mixed up.

    30-battery with fuse inline
    87-horn
    85-ground
    86-switch


    You could also supply positive power to 85 instead of ground, and then use 86 to supply a switched ground to activate the relay. Most factory horns are wired with a switched ground to the relay.
     
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