I installed this horn along with a low frequency freeway horn (Fiamm 72112 Freeway Blaster LOW Note Horn) on my 2017 Mazda MX-5 Miata. The factory horns weren't loud enough to draw the attention of another driver on the interstate. These are nice and loud. I was able to mount them on the factory brackets and hook up the factory wiring harness. Fiamm includes a short piece of wire with a 1/4" quick connector on one end and a ring terminal on the other end. If your factory horn wiring only has one wire for each horn, like on my Mazda, just use this wire to connect one of the horn terminals on the horn mounting stud. The horn has no polarity so you can ground the terminal which is best for the orientation of the horn. It should be pointing down or tilted down to prevent water pooling .
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