2002 Seirra horn fuse

I have 2002 Sierra Z71 and I keep blowing the fuse for the horn. I can lock the doors and set the alarm with my key fob and the horn will chirp every time, but it I go to use the horn the fuse will blow, if I use the horn for a quick beep the fuse is fine but if I have to lace on the horn for somebody cutting me off then the fuse will blow. Anyone got any ideas