I used this to boost the weak horn that comes factory installed on a Toyota FJ Cruiser. I used an existing attachment point and created my own loom so I don't have to cut into the factory wiring and wire the stock horn. This allowed the horn to be operated from the stock horn switch in the center of the steering wheel. I needed a separate signal feed from a 20A backup battery, although I've read that increasing the OEM from 10A to 15A might work (but I found it a bit dodgy). I live in Dubai and having a road is very important. Very happy with the effect that occurs when someone tries to cut me. You sure know I'm here now! Great product and I'm thinking of replacing the stock horn with a big bad Max.
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