Fitting & wiring twin horns

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I am intending to fit twin horns in the near future, but, what about wiring them up ??

Do I need another relay ? as there is already one in the circuit as far as I can tell

A simpleton wiring diagram would be very helpful, thanks

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KGB10 horn diagram.pdf

the circuit is rated for 10 amps a horn is roughly 3-4 amps each (decent quality items)

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Thanks Bob, very helpful