Horn Installation on SL2 97'

Hello,

I have a 97' I am trying to install a new horn on. The original horn
stopped working and I am replacing the horn with an air horn. Just
wondered if anyone has done anything similiar with the horn. There are
three wires to work with. Not sure what to do with the extra wire. I
assume one wire is pos, gnd, and relay/switch for the third? Thanks,

 

....my 97 had a defective horn (however it worked fine), got a letter from
Saturn stating there was a problem with it, and they replaced for free. You
might ask your dealer to run your VIN and see if you fall under the 'Replace
on Saturn's Dime'. I thumbed through my Chilton's and nothing about it's
wiring...