Idle & Backfire

[memetic]

Well, you know the horn itself works.  First make sure your brake light works.  If it doesn't, check the fuse, they are on the same fuse.  The violet/black wire at the horn should have voltage, key on.  The switch grounds the horn, allowing it to beep.  It does this with the green wire, which connects to the switch, terminal J. 

Awesome! Thank you! Thanks everyone.