help wiring stebel on 09 Nomad

[paddyo]

I have the positive to the stebel going from the positive on the battery, through a 20 amp fuse to post 30 on a relay. Post 86 then goes to the positive on the stebel. The negative on the stebel goes to a frame ground. Using the schematic from the manual posted on this board for the 09 Nomad, I tapped into the brown/black which goes to the stock horn to post 86 on the relay. The schematic shows a black/yellow going from the horn switch to ground. I traced the wiring bundle from the left handlebar switches into the headlight bucket and found the black/yellow wire. I tapped into this one and ran the wire to post 85 on the relay. As soon as I turn on the key, the stebel sounds, even though I am not pressing the horn button. My goal is to have both horns sound when I press the horn button. What am I doing wrong? Thanks in advance for your help.