I tried to hook up a DC horn to my wr426. And guess what this bike is all AC current, duh. So now you need a battery and a rectifier, man this little project can get expencive. The solution accured as I burned the toast and the smoke alarm went off. That little bugger is loud. I yanked that thing off the wall, ripped out the horn and the 9 volt battery. Mounted that little big horn on my bike with the 9 volt battery and a button switch and whala. Sometimes things are as easy as burning the toast.