Originally Posted by martysmartie

Lol, the previous owners 'cure' was obviously to disconnect them

Anyway, the relays ground is switched, so that is what is happening, if you remove the steering cowling, at the top you will see two brown wires, these are from the horn switch, disconnect this plug first, it may be these have got chaffed and are shorting to ground, if it continues then it's a case of tracing the ground back to the relay.

As a word of warning I had a the same problem with mine, years back, horn going off round corners etc and it nearly caused a fire, I was just leaving a show of all places lol, I saw the smoke from under the cowling so never ever came of it as I put it out. Until you have it resolved it's worth removing the fuse.

Martin