I just finished running the wires for my new air horn. I grounded it to the chassis and ran the wires to the cabin mounted switch. my question is this, where would be a good place to tie the positive wire into? Either 12v always or 12v when the key is turned to ACC and where? Where have you guys tied into if you have put another horn in?

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1981 300 SD 213k miles "Stock for now"
1999 Super Duty 7.3L 113k miles
1981 300 SD 180k miles "Heavily modified" SOLD