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Patrols, like most vehicles switch negative via the horn switch in the steering wheel to the horn relay.
All you need to do is cut the Green with a Black trace wire that runs between the horn relay and the original horn switch in the steering wheel. Connect these two wires to your new horn selection switch and wire your air horn relay to switch negative via the same switch.
Or you could just connect your air horns to your fuel pump.......LOL
This thread reminded me I have some in the garage to put in. I have the triple horns. Love them :)
Need them these days, too many who can't drive.
A few here have fitted the Stebel 12v horn All I can say is very loud.
I have a train horn that I'll be hooking up soon but on its own circuit
with air tank and compressor. Have a bit of 12v work to do. Son is Auto Elec
so chances of getting something done is very slim, lol
Got the air horns all fitted up this weekend. Working well and sound great. I have amended the wiring diagram in first post because I had one wire wrong going from factory horn relay to switch but now it is correct. Only had to run one ground wire through the firewall from engine bay which made it easy. I used a narva on/off/on SPDT switch which is handy so now when im cleaning the interior both horns can be turned off by putting switch in middle position. Cheers for all the advice. Always makes it hard when there is more than one way to do something but I'm happy with the way Ive done it