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Message: <blockquote data-quote="KaeZoo" data-source="post: 1388871" data-attributes="member: 554753">It doesn't matter whether you use 85 or 86 to connect to the siren output; one goes to the siren wire, the other goes to ground.I don't know exactly what terminals you have on your air horn.  If it's just positive and negative, then I'd ground the negative and connect the positive to 30 on the relay.  Then connect 87 on the relay to your battery.  Be sure to fuse any wire you connect to the battery.</blockquote>

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