Found an old Ford Air Horn Installed in the Truck I Just Bought

[MuddyJeep810]

So I bought a '14 1500 yesterday and it has air bags in the rear (helper bags inside the coils). I saw what appeared to be a compressor and vacuum lines under the hood, but I didn't really get a chance to take a good look at it until today.

Turns out it's an old Ford Air Horn! I've never installed something like this so I'm a rookie but I'm trying to figure it out to see if I can get it working.

There is an on/off plunger switch that is inside the cab under the steering wheel. I'm guessing this enables it, but I'm not sure if it's wired into the factory horn at all.

Anybody have any experience with these things?

 

[04fxdwgi]

See an electric solenoid, so there has to be switch somewhere. one of the wires is already grounded, so follow the other wire and it will maybe lead to that aftermarket relay by the battery. Then the relay will be controlled by a switch, or the power for the regular horns (probably).