Finally figured out why the horn doesn't work. 1) Toggle must be in up position 2) Must have good relay 3) Spring is missing behind horn button...I used a jumper wire between the hot terminal and terminal 2 where relay plugs in, horn works. Jumped between hot terminal and terminal 3 and got power up to contact behind horn button mechanism. I've realized, and 34P has confirmed, there should be a spring the goes between the contact and metal plate behind horn button. Does anyone have a picture of this, or dimensions? Is there something that keeps it centered on the contact so it doesn't touch the contact and metal around it? If you've had one of these apart you'll know what I'm talking about.