I honked my hatch's horn last weekend and realized how wimpy it is. I figured I'd get an air horn instead. However, I don't want to be pulling up to a friend's house late at night and have to honk my air horn to let them know I'm there, I'd prefer the wimpy stocker then. So I figured I'd mount a momentary switch somewhere that when pressed makes the steering wheel horn buttons switch to the stock horn, and when the switch is open it defaults to the air horns.
I originally made this wiring diagram but I don't think trying to run the air horn compressor off the stock +12v horn trigger wire is a good idea.
So I made a new diagram using one relay to monitor the stock +12v that goes hot when the horn button is pressed and when it sees that hot, sends a heavier gauge fused power to a second relay that handles the horn switching. The momentary switch will trigger that second relay. At rest, input power connects to the air horns, and when the relay is energized it switches input power to the stock horn.
Just wanted to post it and see if it looks good, or if there is a more efficient way.
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