***update***
OK, removed the steering wheel and canceling cam today. Grounded the turn signal springy-rod thing to the steering wheel shaft. I did this with it both pushed in, and sticking out. NOTHING. So this is not the problem. But remember, it DID previously "jump honk" with a screwdriver touching the horn cup and screws simultaneously before I cleaned those parts. I must have shorted something out somewhere, but I cannot imagine what it could be. I also "battery honked" the horn with a jumper wire just to be sure the horn had not blown out. Next step...?
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