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Originally Posted by Long & Winding road
Thanks, Thats what im thinking. I wonder how they are connecting up the power supply...from the OEM fuse box or directly to the battery then used the factory horn to turn the relay on? Or I guess I can use a seperate button for the air horn.
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The easiest way would be to put an inline fuse on the battery to power the relay. And like you said, tap into the horns signal to activate the relay. That is how I would do it.