Quote:
Originally Posted by mrlmd
Most of these horns, and that's like a knock-off of a Stebel air horn, CANNOT be directly wired up to the stock horn button and wires. They need to be connected usually directly from the battery to a relay and then to the horn, and the horn button and existing wiring the goes to activate the relay. The Stebel and similar ones are protected by a 20 amp fuse and heavier wires are used to power them from the relay than are used for the original horn wiring. If you run the horn like that you have a risk of burning out the horn button and the wires, or melting them, and in a severe accident, could start a fire.
See the 2 wiring diagrams attached. You should have gotten a relay with that horn, otherwise go pick up a 20 amp rated relay and a 10 or 20 amp inline fuse and do it correctly. That may be only another 5 dollars or so. Otherwise you may not have any horn soon or some other problem with your bike.
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+1
Always wire things up the proper way, even though it will appear to "work" by simple plug&play, long term reliability may be compromised. Use a relay to wire the air horn, check for the proper AWG, make sure fuses are of correct Amperage rating, etc. If you don't think you can do-this-yourself, have someone with competent electrical experience do it for you.