I've tried and failed, OMP steering wheel - horn fail.

[blueandy]

I've tried, I've googled, nothing has come good so far.
Considering the OMP Corsica dished wheel is so common I would have thought this would be all over the web.

The car has a brass/copper spiggot (flap), the OMP wheel boss has a brass slip ring, there is good contact between the two.
There is a single spade connector coming up from the boss.

I connect the spade to the horn push, nada, as you would expect.
I get the trusty multimeter out, I've got a positive supply to the horn push, but no route to earth.
I try the boss, the ring, the spiggot everything and I cannot find an earth.

I don't want to have cable round the boss as on full lock it will be under tension, if it's long enough then it would look gash.

Please help.

[xionsolaris]

I thought the spigot ring is the earth

[tweed]

You need to do is connect the spade connect from the car to the button on the wheel.

 But you've done that so maybe the switch is at fault?

[blueandy]

so just the single spade connection?
what does the horn push do then?
The multimeter shows no earth in that area, and if the horn push is acting as a switch then it needs to have a supply and a return else how is it making the circuit when pushed?

I don't want a separate horn swtich on a toggle if it can be helped, so I'd like to figure this one out.

Thanks for your help so far

[spikenipple]

The horn push has a little steel spring on it's periphery that touches the brass spigot, which touches the boss, which earths through the spline.

[blueandy]

I must have a dodgy relay then, I can't find any earth in the spline or anywhere within the boss.. 

[spikenipple]

There isn't a connector, it earths to the chassis. Try pulling the trim off beneath the steering column and checking for continuity between bare metal and various bits of the steering wheel assembly.

[blueandy]

cheers I'll give that a go.
Maybe during the strip down something got dislodged...