[jb_supermoto]

I'm pretty new at this as well, but look at your ammeter while you push the horn button. If the needle moves to discharge slightly when you push the button, then the button and the wires to the horn are likely ok. There is current draw, but the horn may not be turning. Pull the back cover off the horn and have a look. It gets pretty obvious when you take the cover off. It's only one screw.. Good luck!