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Wiring for Air Horn gone wrong

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  • Wiring for Air Horn gone wrong

    Alright, trying to install an air horn on my 2001 R* Silverado. I have wired everything according to the diagram using the relay (4Pin). When I connect it to ground and turn the power on the air compressor runs with or without the horn button pressed.
    87 is connected to the positive terminal of the compressor
    85 and the negative lead from the compressor are wired together then wired to the negative terminal of the battery
    30 is wired to an inline fuse (20amp) connected to the positive terminal of the Battery
    86 is connected to the pink wire coming from the horn control (connected in the headlamp assembly just past the connector
    What am I doing wrong?
    I have also ran 86 to the pink side right off the factory horn and it runs continuously off of that as well. I have also moved the ground from the battery terminal to a bolt on the frame with the same results.

    TIA
    Attached Files

  • #2
    Use the wiring from the original horn connection down by the frame (brown and pink wires in a plastic connector I believe). This will be your trigger to activate the air horn. If you connect up in headlight I imagine your NOT using the horn switch with is what lrovides/takes away the ground.

    LET'S RIDE

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    • #3
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      according to service manual…. The brown wire at the horn is the switched 12 vdc…. You may want to trace the wire to the headlight bucket and confirm your wire…. I kind of doubt that it became pink in the headlight bucket. My guess is the pink wire is the 12 vdc feed to the horn switch….(as per wiring diagram color codes) Brown is the return from the switch that is hot when you press the horn button…

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      • #4
        Ooops…. Just referenced the print…. Pink is hot all time… the horn switch makes the ground…. (Switching ground)….
        85 and 86 are the relay coil…. Horn button switches ground…. Pink is hot…. Brown is ground…. Tie pink to 85 and brown to 86…. 30 to fused hot… 87 to compressor positive…

        disregard my previous post…

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        • #5
          Disconnect terminal 85 from ground and add a jumper between terminal 30 and terminal 85 and you'll be good-to-go.
          All the other wiring remains the same.

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          • #6
            Been busy moving and haven't had a chance to work on this for awhile. I have wired up the horn as indicated in the Wolo Horn Diagram diagram I've attached at the bottom. The horn works as intended when the key is ON. However, when the key is turned off the switch wire on the horn grounds out causing the horn(air horn, not the factory horns) to run nonstop. What am I missing here. I've double and triple checked the wires and I don't have any knicks or exposed wires anywhere. In the headlight can, 85 is run to the PINK wire coming from the horn. I get the same results when I plug 85 into the black wire. If I remove both factory horns the air horn stops running when the key is OFF but will still work if the horn switch is activated.


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