Test the horn fuse and horn relay if you have one. If you have power to horn switch test to see if you have power coming out when horn button is pressed. This can be done without power if you want you are merely checking to see if pressing and releasing the button changes whether you have continuity or not. If that tests okay then test the horn itself with a fused jumper to the battery. Remember - test fuses and wires first and ensure all connections are tight.
Testimonial: "Thanks , have established that I have power to the horn so need a new one. Thanks again"
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