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Hi guys, fitting air horns to the patrol and its been a while since I worked all this stuff out on another car so have forgotten a bit. Is the wire going to the steering wheel a ground wire on the 2000 GU DX? I will be running stock horn and air horns separately via a switch. Here is a pic of the wiring diagram I have drawn. Looks even to me a bit complex but that's because I want to use the 5 pin relay to power both horns and the original power to factory horn as the power to the relay coil.
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