you could wire it up to a cigarette adapter and then plug it into a transformer like this one
http://www.thinkgeek.com/gadgets/travelpower/afee/
first off, which end of the horn are you needing to install, under the hood is one thing, in the steering column is a whole diff story.
There really is only one way to turn off the air horn in a truck. You need to disconnect the horn.
The 1992 Chevrolet truck horn is located in the front of the engine compartment. The horn will be on the right hand side of the radiator.
Yes. Most people with cars today are thinking of changing their current horn to a truck horn by simply putting the horn at the back part of their car.
Below are attached links discussing the horn on your truck.
buy a new horn and install it
You can replace the standard car horn with pretty much any horn you want. Given that many truck horns are powered by air, it would be difficult to duplicate in a car unless you can rig an air compressor.
In order to install an air horn on a motor home you will need to but the air horn kit and follow the direction supplied within. Although air horns are generally limited to semi's.
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Check the contacts first to make sure they contacts. If they do, test horn.
You don't have to unplug the horn to replace the battery.
the trains horn is very loud.