First you will have to determine if your horn activates by earthing via the horn button or by connecting to positive via the horn button.
Locate the old horn and remove its wires. Connect these wires to the relay on pins 85 and 86. Operate the horn button and the relay should click.
Run a new wire from battery positive to relay pin 30.
Run a new wire from pin 87 to the horn positive.
Run a new wire from horn negative to an earthing point close to the horn or to battery negative and you're done.
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