Horn issues

[tag89]

Evening all

Having some issues fitting my momo wheel, has a BG boss specific to the Fulvia (although seems to come with two horn rings)

All goes on fine, there is wire coming through the shaft which is a live

I assume the wire on the boss was the earth, connect to the two terminals on the horn, when pressed you get sound…simple?! Or not. The important last step isn’t happening.

So I’ve tested the live with a light and all good.
The horn itself works, if I touch the inner ring to the outer ring with a clamp it goes off (found that by accident…)

If I join the live to the button then a wire to the ring there is nothing
If I put the wire to the shaft and press the horn a relay clicks but no horn.

I’d assumed the ring on the wheel would be the earth but seemingly this is wrong?

Can anyone explain how the setup actually works and it may help me figure out where the issue is!

Few pictures, test light is when the horn beeps.

[tag89]

An update..

I did not realise that the centre button flashed the lights and the outer centre did the horn. So that helps massively as it explains why the centre wire from steering shaft doesn't sound the horn

And in a further complication turns out the horn button that came with the new wheel is faulty. So once that is rectified I think the problem is resolved.

Now onto servicing those lovely Dunlop brakes...