Clutch is right, the horn should be just under and to the rear of the battery side cover just above the passenger foot peg area. It is attached to the frame with a single bolt. Here are a couple of pics of mine. Hope this helps.
Yup, it's missing completely lol, I guess that explains why it was so quiet! It saves me a step when i install my wolo bad boy! Thanks for the pics. I need to get a manual and wiring schematic for this thing, I'm finding all kinds of things missing, and unused plugs etc. Thanks again.