An ascMcLaren forum for 84-86 Capri and 87-90 Mustang based cars modified by Automotive Speciality Corporation, a Division of American Sunroof Corporation. (no affiliation)
Imagine my surprise as I'm standing in my house yesterday and I heard a horn and it kept going and going and going. It turns out the horn on my '89 McLaren appears to have shorted and I need to replace the part. Of course, inspection is due within the next month and I believe I'll need the horn to pass.
I'm not quite sure how to describe the part. It's not the top part of the horn (from the steering wheel) that's needed, but what's underneath. It has an embossed part # on it and I'm hoping this will help to identify it. Ford E7ZC-13K802-AWA. Perhaps if someone has an aging car that's too sick to make it on it's own, you'd be willing to sacrifice the part to help another.
If you're talking about the two metal plates (switch) underneath the horn pad cover that touch together to complete the circuit and honk the horn, you can fix it yourself.
The cause of the problem is the foam rubber that separates the plates dry rots and the plates come into constant contact, causing the horn to blow all the time. If you rig it with some foam rubber (I used window insulation strips from the hardware store that I cut down to fit) it should work. Not ideal, but an easy/cheap fix. I haven't had problems since.
Thanks. Yes that is the part I'm talking about and your explanation sounds logical and well worth the try. The foam currently in place does look a bit weathered and it's very likely there may be some bare spots that disintegrated somewhere between them. I'll give that a try as soon as I have moments of free time.
