Visually inspect horn make sure its not corroded and wiring is on it tight. Then use a voltmeter and when horn button is depressed 12v should register on the meter. If 12v are there and horn doesn't sound the horn is defective. If 12v does not make it there then its either the relay or clock spring (located inside steering wheel) most likely. A visual inspection should pretty much do it with the clock spring (corrosion ,wear of contacts). Relay must have B+ going to it at all times and coming out only when horn is depressed. good luck
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