Well, I changed my steering wheel a few months ago and found that the horn wasn't working. I tried various things at the time and decided to get a new horn.

Now I have the new horn and plugged it in and it still doesn't work. So went through the checks again. Checked the fuse and this is fine. Also tested the circuit at the horn, with positive to the horn wire and earth to a body panel, no power!
Removed the steering wheel to test the circuit there, and there is, but on the horn button there is a constant power, push the button and the circuit breaks!

When you close the the circuit without the horn button, there is a circuit and a click from the dashboard.

Basically:
New horn
Fuse okay
Power at steering wheel and an audible click when circuit made

Any ideas what else maybe at fault? I wouldn't have thought there was a relay for the horn, but is there?

Thanks