Ok, so im 17 and ive been riding motocross since i was 10 and i just decided to go get my first street bike. Picked up a 99 suzuki katanna 750 and so far im loving it! Only one problem thow, im having problems with the horn. Ok, this sounds stupid and normally i wouldnt care about it, but in order to get it registered i need to figure out how to get the horn working. I didnt notice it didnt work until i got it home and i looked at the actual horn and it was unplugged, ok, easy fix rite? Not as i thought. So far, everytime i plug it in it either holds open and only way to turn it off is by turning the ignition off, or it works everytime u hit the switch (like it should) for a few times and then holds open somehow, or will hold open sometimes when i turn the throttle or hit the kill switch as if its being shorted out. Just wondering if anybody has any ideas? Before i got the bike, a guy put in underglow and a little fader switch on the dash that dims the backlights, but another guy pulled all the under glow out and just left the switch. So, im thinking the switch has something to do with it? any ideas?

Congratulations on your new toy!!
The Katana is an excellent sport/tour bike....plenty of usable power in an air cooled, easy to maintain package.  Plus you get a comfy ride.  The fuel tank is huge for the longer trips.  Be sure and upgrade your brakes if they are less than 50%...no good can come from 90+ horsies if you can't stop effectively.
Most horns are operated by a contact switch.  Over time, they can be damaged by oxidation and will present the same symptoms you describe.  Check with your favorite online store and get yourself a replacement.

Edited by f800strider, 21 August 2012 - 04:25 AM.

A afore mentioned contact switch is usually known as the horn relay switch. Check one of the many parts fiches around the web and you'll see what and where it is on the bike.
Congrats on the Kat. Cool old bikes.

I had one new back in the day , very reliable .