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Air horn hookup

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by Bubba Ray Boudreaux, Dec 13, 2001.

  1. Bubba Ray Boudreaux

    Bubba Ray Boudreaux 1 ton status

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    Just got me an air horn from Harbor Freight, hey they were on sale, plus it should be good, it's the same brand that's on a race truck I know. Anyway, I'm way out of time and was wondering if anyone could give me details on hooking it up? Was going to place the horns where the stockers are, but I'll have to get more hose and the destructions say keep it away from mud, water and stuff, so I guess under the hood is the place to go. Should I just find the horn hot wire and splice in? Then run the ground to maybe the same ground as the battery cable since it's close?

    Bubba Ray Boudreaux,
    Official Colorado K5.com Fantasy Football Choke Artist!<a target="_blank" href=http://community.webshots.com/user/mdntrdr1>http://community.webshots.com/user/mdntrdr1</a>
     
  2. Leadfoot

    Leadfoot 1/2 ton status Premium Member

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    Mine (and most have a relay to keep high current from your horn switch, plus the shorter the wire from the 12V source to the horn the better, just like lights). Usually you have your horn wire the goes to the relay trigger side, a ground that goes to the relay, a 12V battery source to the relay (normally open circuit on relay), and a wire running from the relay (other normally open circuit on relay) to the "+" side of the compressor and a ground that goes to the "-" side of the compressor. The hose is self explanatory and comes with splitter(s) if you have multiple horns, but the shorter the overall length of the hose the better. **NOTE** as stated keep away from heat, water, debris, etc. (within reason) and some compressors need to be mounted in the vertical postion (yours will state if it needs to or not, but most do).

    See my rig at <a target="_blank" href=http://coloradok5.com/gallery/Leadfoot> click here </a>
     
  3. Bubba Ray Boudreaux

    Bubba Ray Boudreaux 1 ton status

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    Here's what I have for destructions.....
    Positive from compressor goes to the #87 prong on the relay; the #30 prong goes to positive battery with a 20A fuse (fusible link?) in between; #86 goes to ground; and the #85 goes to horn button; which I guess I could either splice in or go all the way to the button since it's aftermarket and on the dash. Another place I'm confused at is the wire that goes to the button is shown with a solid line like all the other wires, but on this circuit, it's shown solid to the button, then there are dashed lines shooting off into a 3 pole, 2-way on-on switch? with a wire coming out of that switch going to the original horn and one spliced into the horn button wire. WTF? Do I need to worry about that, or just go into the horn button and leave it at that?

    Bubba Ray Boudreaux,
    Official Colorado K5.com Fantasy Football Choke Artist!<a target="_blank" href=http://community.webshots.com/user/mdntrdr1>http://community.webshots.com/user/mdntrdr1</a>
     
  4. Leadfoot

    Leadfoot 1/2 ton status Premium Member

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    To be completely honest, I am not sure what the 3 prong switch deal is (maybe it's showing you can either have a button on the wheel or aftermarket button, or both). If you have wire going to the horn, I would just splice into that. It should be a negative ground system and work fine. If not let me know.

    See my rig at <a target="_blank" href=http://coloradok5.com/gallery/Leadfoot> click here </a>
     
  5. Bubba Ray Boudreaux

    Bubba Ray Boudreaux 1 ton status

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    Got it done in 1.5 hours. Put the whole setup on the driver's side wheel well for now. Eventually I'm going to 'glass fenders so I'll have to relocate. First, I pulled the main wire off the stock horn, cut and replaced the connector. Then hooked the compressor into the horns, then the horn wire to the relay and relay to compressor. Then grounded the compressor. I got lost here, thought if I was hooked up to the main horn wire, it should work, but didn't. Diddle around for awhile, hooked into the horn button, still didn't work so I was lost. Then I decided what the heck, I still have the wire for my blown amp still routed so I pulled some out from the inside, prepped that and then hooked the other side straight to the battery. Didn't think it would work, but about did the deed in my pants when it did work. The wire to the battery isn't fused like the destructions said, should I worry? My wiring job isn't the cleanest, but when I get back from my road trip, I'll clean it up some. Thanks for the help.

    Bubba Ray Boudreaux,
    Official Colorado K5.com Fantasy Football Choke Artist!<a target="_blank" href=http://community.webshots.com/user/mdntrdr1>http://community.webshots.com/user/mdntrdr1</a>
     
  6. Leadfoot

    Leadfoot 1/2 ton status Premium Member

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    <blockquote><font class="small">In reply to:</font><hr>

    but about did the deed in my pants when it did work

    <hr></blockquote>
    Those things are loud aren't they (especially when they are like 12" away from your ear. Did the same thing while testing. As far as the fuse, you should put one in, the current draw on a compressor is quite big and if your horn button fails and the compressor stays on, you could melt some wires without the fuse to protect it......actually for anybody.....any time you add electronic equipment the circuit should be fused somewhere to prevent overload and/or melt-down.
    Anyway, glad you got it to work...air horns are an easy "mod" and they kick a$$ (especially for motivating pedestrians who run down the sidewalk but take their sweet-a$$ time once they reach the crosswalk). Hit the horns and they get the deer in the headlight look and move quickly. I don't do it for elderly or people who are curtious by moving a decent pace, but those that run to make you stop and then walk at a snails pace I get a little frustrated with (because they do it purposely). Airhorns.....the legal revenge tool! Plus it's a great attention getter [​IMG].


    See my rig at <a target="_blank" href=http://coloradok5.com/gallery/Leadfoot> click here </a>
     
  7. Leadfoot

    Leadfoot 1/2 ton status Premium Member

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    <blockquote><font class="small">In reply to:</font><hr>

    but about did the deed in my pants when it did work

    <hr></blockquote>
    Those things are loud aren't they (especially when they are like 12" away from your ear. Did the same thing while testing. As far as the fuse, you should put one in, the current draw on a compressor is quite big and if your horn button fails and the compressor stays on, you could melt some wires without the fuse to protect it......actually for anybody.....any time you add electronic equipment the circuit should be fused somewhere to prevent overload and/or melt-down.
    Anyway, glad you got it to work...air horns are an easy "mod" and they kick a$$ (especially for motivating pedestrians who run down the sidewalk but take their sweet-a$$ time once they reach the crosswalk). Hit the horns and they get the deer in the headlight look and move quickly. I don't do it for elderly or people who are curtious by moving a decent pace, but those that run to make you stop and then walk at a snails pace I get a little frustrated with (because they do it purposely). Airhorns.....the legal revenge tool! Plus it's a great attention getter [​IMG].


    See my rig at <a target="_blank" href=http://coloradok5.com/gallery/Leadfoot> click here </a>
     

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