I had a problem where the horn would come on and go off as I turned the steering wheel, after hours and hours of tracing - taking the steering wheel/column off trying to insulate everything, it turned out to be the split pins on the rubber steering disk... As the steering wheel turned, the pins bridged across and made an earth and the horn went off!
Doesn't matter if you're half expecting the horn to go off, it always makes you jump when you're right next to it :lol: (and it seems much louder in the middle of the night)
Rob Amos
Happiness is a stock VW