This is so weird. 
My friend Mark(a shade tree genious) and I just finished instaling two stable air hornes inside the shrouds of my 86 VR. Tight fit,but got them all in. 
Using the wireing diagrahm that came with the horn-wireing instructions (posted on the Biker hiway site-(supplier)) + a small,very simplified diagrahm (also on that site). We finaly figured it out.   
Here's  the kicker---They work beutifuly---for Mark......No one else. 
No matter how I ,or any one else,  pushes the button--nothing. 
Mark steps up-touches the button-BLATTTT. 
We've tried blindfolding the bike-wearing gloves-bare foot or rubber sole. 
Thinking of trying exorsism--Last resort will be --Get Mark drunk,amputate his thumb,and tape it under mine. 
Please save Marks thumb-suggistions------