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The beeper should be in front of your battery, small gray box, you could disconnect it and splice it to trip a relay and then add in a new horn opposite of the factory location. The factory wires would go to terminal 85 and 86, and then you would put fused 12v to terminal 30 and the horn wire would be on terminal 87, the ground for the horn would be at the horn mount
I was looking into something similar a while back. The small gray box Boghog1 is talking about is super tiny for how loud it is. I'd love to have options to put in another sound. Like the traditional "chirp chirp" or better yet "MOOOOOO!" I really like the idea of my truck mooing. Not sure if that functionality is without the range for a Piezoelectric speaker