Horn diagram

[lifethroughdeath]

I looked in my Haynes but I can't find a wiring diagram with the horn on it. I need to touble shoot my horn, as it never worked on a regular basis since I bought the K5(1990). And if worse comes to worse I'll wire in a new button somewhere. Any help would be great. Thanks,

 

[m j]

really tricky circuit that one
the switch in the steering column and a horn connected by, you guessed it, wire

 

[77crewcab]

As a related question, can someone tell or post a diagram of the horn assembly in the steering wheel. I know I am missing parts once I remove the horn button but I have no idea what to look for.