The Horn is located behind the headlight near the fender. it is silver and with the grill removed, if you look back and to the side of the truck, at just the right angle, you can glimpse it.

to get to it, remove headlight assy, but be careful not to break anything.

If all you want is to access the wire, to tap into it or run it to your compressor, well, I am still trying to do that.


If you figure it out, let me know
len

 

I would recommend leaving the stock horn and adding a push button for air horn. The stock horn relay and fuse might not have enough juice if you are using a compressor horn system and this way you can still use the ordinary to avoid sounding obnoxious.