Question about Honda CB 900 Hornet Motorcycles

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I installed a wolo air horn 419 and when I push the horn button all I here is the compressor and no horn.

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It is possible that you may have reversed the polarity on the compressor; it may be "pulling" air instead of blowing it out. Remove the air hose from the compressor and put your thumb over the air outlet while pressing on the horn switch. If you don't feel air blowing out, reverse the positive & negative wires going into the compressor and repeat the test. The air horns should work at this time.

Note: Always install a relay on this type of horn system; the compressor puts a high amount of load on the horn switch if you don't.

Posted on Apr 09, 2011

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How do you remove the horn

Hi, Michael first check for continuity at the power and ground wire at the horn, then check for continuity at the horn button, back in the day there was a small adjustment screw on the back of the horn, by turning it one way or the other you could set the limit on how much the diaphragm vibrated. For more information about your issue, please visit the websites below, and for specific information or questions, please feel free to contact me at Good luck and have nice a day. Mini Beast Air Horn Installation
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How do i install wolo horn on jeep with two factory horns?

If you are trying to make it work simultaneously with stock horns, I suggest you wire it in through a relay. Without a relay you will be placing too much of a load on the horn circuit.
A relay is typically used to control a component that draws high amperage. The relay allows full power to the component without needing a switch that can carry the amps. The switch only controls the relay. The relay then provides a direct connection to the battery. It should be noted that either the power(86) or ground(85) in the relay control circuit can be switched. In the case of a horn, the horn button would be used to switch the ground lead(85) and power(86) would be provided directly from the fuse box.
This is a typical wiring diagram for a standard relay installed for headlights, horn, fuel pump, electric fan, etc. If the relay has a 5th terminal, it is not used.


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1 Answer

Horn doesnt work

Check power to the unit and power coming out of it. The pumps go bad on the horn like that a lot.If you have access to an air compressor then run air through the line to the horn portion and see if it works. If it does then more than likely it's the compressor unit being bad.

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Instructions for 2 terminal electric car horn

If you are by passing your original horn, disconnect the terminals going to it and place the new horn's wires in the horn terminal area. If the wires are color coded, red is for 12V black is for ground. It works when you close the circiot by pushing the horn.

If you are adding it, find your horn wires and splice into them. Each horn would operate seperately when it is pushed, the circuit is closed.

Last arrangement, find your horn wires on the original horn, hook wires from that horn and spilice the new horn wires into the one you want to add. do not connect it to the twelve volt When you push on your horn it will close the circuit for both horns to go off,

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Horn does not work; where is the horn?? in a 2002 2500HD 4X4? Many thanks.\r\nBob ibGorham Maine

There's two of them located just above the parking light in front of each of the fender wells. You will be able to see them from the bottom looking up

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How to install wolo air horn #519 2004 ultra

Hi Benjamin, for more information about your question please visit the websites below. Good luck and have nice day.
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How to install a wolo air horn #519 on 2004 harley ultra

Hi Benjamin, please be aware that this question has already been asked and answered. Thank you.

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