3rd post with year.
you can guess and replace all 3 parts and fail (wires bad)
use a voltmeter, and see if 12vdc makes it to the horn
it it is , the horn is bad, or not grounded
if not, the the relay, we can check that too with a voltmeter
12v across its coil means the switch is good.
12v not output from relay, with coil hot is a bad relay
easy huh?
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