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My 1987 pickup has a broken horn too. I looked into it and think I know the reason. The steering wheel has a little pin that rubs up on a metal disk, and this pin and disk are what supply the battery voltage to the horn button on the steering wheel. I can see a small gap between the two. The pin appears to have been worn away just enough that it doesn't make contact anymore. If I shove a piece of metal into the gap my horn will work. I need to replace the pin.
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