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I know this is a pain, but have you tried installing the steering wheel with the horn button in place? It sounds like you have no ground through that threaded rod, but you might have contacts on the steering wheel itself that connect through to the clip and harness. I know how it feels to stumble on a little thing like a horn, especially when you spend hours trying to figure it out. Some times another set of eyes may see something you have missed.
Good luck, keep us posted on your progress.
Regards,
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Jerry
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