Join Date: May 2004
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With key on, grab your front brake and see if the brake light lights up. Then do the same for the rear brake. If it lights both times, you're wiring is fine, thats where horn gets its power from. You probabaly got some crap in the switch itself from a washing that is coating the contacts. I can't imagine them to be corroded or rusty on a new bike. Spray some contact cleaner in there or take it off and OHM it out with switch in open and closed positions.
I would check for power with a voltmeter at the horn itself to save you all the work of dissasembly first. If it has power and a good ground, it's the component. Hope this helps.