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dleroy43 must not have a working horn. You'll have to pull the horn button/cover to investigate. The screws for the contact ring, have plastic insulators that get brittle with age. They might be falling apart.
Don't discount the cigarette lighter. I wasn't joking. Everything in the dash is grounded together in a funny manner. I had a similar problem and it was a bad lighter. I almost guarantee it is the lighter.