Fourfourto, I don't have an answer to another 12 volt location. The PIAA horns can be connected to the existing wires with new connectors. These wires are very thin, not strong enough for your airhorn.
I will look under the hood if I find a good place I will let you know.
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2006 Hummer H3 Adventure, Black with Cashmere Interior, PIAA Horns, SMA Heavy Duty Brush Guard, FlowMaster 50 Series Delta Flow Exhaust
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