Hi everyone, my name might throw you off I’m not a pothead, I just work at a pizza restaurant, I’m in the middle of nowhere, Arizona (I know that narrows it down a lot doesn’t it :rolleyes:), I drive a 09 scion xb (hence Toasted) with the shocker xl horns on it. I got everything wired up almost the way I want it but it works for me currently so I might just keep it this way. I’ll post pictures of the setup when I get a chance, but I can describe it for now.
The train horn is currently wired to my steering wheel but with a 5 pin relay that has a normally closed (N.C.) and normally open (N.O.) pin. That is so the normal electric horn I have can be used and I don’t need to wire up another switch. That relay is wired to a LED lighted switch that is powered from the ignition, so you need the ignition on or the engine started to switch from the electric horn to the train horn solenoid (no accidents that way, no key = only regular horn). The horn trumpets, solenoid, airtank, and compressor are all mounted under the spare tire outside the vehicle together. The only tank I could fit is a 2 gallon tank with 3/8 inch openings on the ends so the trumpets aren’t getting all the air they need as fast as they should.
I managed to get a sweet deal (at the time, don’t know about now though) on the air compressor I was going to buy a Viair 350c but the shop couldn’t get one as the warehouse they deal with ran out. They did hook me up with a 380c from a pair that another buyer only wanted one of, so they sold it to me for same price as the 350 (at the time $40 savings). The air compressor is wired with another relay between the pressure switch (viair 110psi - 145psi sealed) that relay is hooked up after the 5 pin relay in the front of my car. So turn on the car, flip a switch, two relays turn on and if needed the air tank gets filled and let the scares begin. Also since I’m in Arizona I have a 175psi blow off valve on the tank since in the summer the heat will cause the pressure to rise in the tank and stress the steel more then it would normally get stressed.
The few things I might want to do is add an extra manual compressor switch, so the compressor doesn’t turn on half way through a blast. The setup is pretty stealth you can only see it if you’re behind me in traffic and you know what to look for. Now after all that you’re probably wondering what else I want to do to the wiring other then the switch? Well it’s a work in progress as I’m waiting for the parts to come in, but I’m going to try and make a wireless switch for the solenoid so I don’t need to be in my car to blast it and can walk away from the scene without being noticed, since the tank will empty but not fill up till I want it to. So there will be two ways to toot my own horn. Plus it’ll be easier to find my car in a parking lot if I just follow the horn. But that’s a major work in progress as I’m trying to tie it in with a FedSig PA300 so I can have a wireless PA mic and train horn blaster in an All-in-one pocket-able setup, and that’s a whole other mess I gotta deal with.
Within the next week I’ll get some pictures up and a few diagrams on how I wired the whole thing up, I would post the diagrams now but my scanner is on the fritz.
But lets just say there’s a few rolls of wire running all over my car for this setup. The best part is that while I was getting parts, the guys at the local checker auto didn’t know what the hell I was talking about. SPST relay with 5 pins? you mean like for the air conditioner? no like the generic cube ones I can get at radioshack which is a 60 mile round trip for me. The guys even asked another customer who they knew about it and he said they haven’t made those since the seventies and my best bet would be to run an extra switch and another horn button, and that I don’t know what I’m doing and I should listen to them. Well I showed them, scared some of their customers as well too :D.
So far I love’em, the local cops hate them but I haven’t gotten pulled over yet because the restaurant I work at feeds just about every cop in the county at some point in the year so they look the other way on somethings for us workers. So many warnings and so little tickets for us 
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I know TL : DR 
'Cause you better be butter if you’re going to touch my toast.