Horn issue 85 911

[Len 911]

Ok . I am at a loss. My horn stays on until I remove the relay. Here is what I have done:
New relay
Removed horn botton
Removed Momo steering wheel
With the steering wheel Removed and insert the relay the horn blows.
What else should I be checking?

Is there anything under the adapter

[HarryD]

If it was me, I would remove the adapter and see if your horn stays off. At the base of the adapter is a spring loaded pin connected to the pigtail shown. The other end of pin runs against the horn contact in the steering wheel.

The hub is like this with the pin circled:



The pin looks like this:



The wire comes from the coil on the horn relay and connects to the stationary horn ring contactor in the steering wheel housing. When the ring is grounded, it sounds the horn.

This thread may be helpful: https://forums.pelicanparts.com/porsche-911-technical-forum/1158595-officially-confused-momo-horn-wiring.html

[Len 911]

Here is a pick with the adapter removed.

[Len 911]

Horn used to work fine, then one day it would intermittent go off. The other day I hit the horn and and it stayed on. Cold it be the horns themselves.

[HarryD]

Does your horn still blow with the brown wire hanging in space?

[HarryD]

This thread may be helpful. https://forums.pelicanparts.com/porsche-911-technical-forum/138526-idiots-guide-momo-prototipo-install-carrera.html

[Len 911]

No . With the adapter removed no horn.

[HarryD]

If you ground the brown wire, does the horn blow?

[917_Langheck]

Have a look at your wire where circled to rule out the shiny spot behind it being a wear point.

[Len 911]

Update. I took everything off and inspected the wires all look good, reinstalled everything and now it works. I took it all off again thinking I missed something, but I cannot see anything wrong. Horn works as it should. The white piece that carries the current is worn a little. Could that be at fault? Or the horn ring that rides against it. ?
Thanks for all the information of east to look for.

[GH85Carrera]

Originally Posted by Len 911

Horn used to work fine, then one day it would intermittent go off. The other day I hit the horn and and it stayed on. Cold it be the horns themselves.

My 74 914 2.0 started hoking on it's own just as I pulled up behind a biker wearing a colors on his Harley. I had to rip the horn mechanism off the center hub to get it to shut up. Fortunately he ignored me.

I ca'
t count the the times I have taken something apart, and put it back together, and it starts working. I never knew what fixed it.