I've experienced recently on My 93 SC with 62,000 mi. intermittent honking of the horn. I have to shut it down & restart to quiet it. A local Ford dealer couldn't get it to act up while in their possession , so no help there. thank you.
It has happened 3 times in the 6 wks., 2 times it quit on its own, the other, I shut the car off & when I turned it back on ,no honking. there is no honking when I use turn signals. I was at a car club meeting tonight & one guy mentioned a horn relay as the possible cause. I'm not much of a mechanic, so I assume the SC has a relay & if YES. where is it located?
Cycling the ignition on & off would not stop it or have any effect if the issue was in steering wheel, colunm or horn contacts or dash wiring as the horn circuit has battery power at all times, not ignition power. I still suspect the issue is with the factory alarm & thats what is grounding the horn relay. Turning the key off & back on is reseting the the system.
Also, cycling the key works the multi-wire ignition switch down on the right side of the steering column. These are prone to come apart with use, and if your's is original, I'd replace it regardless...less than $20 as I recall. Search here on the replacement process.