Originally Posted by Veronica
No, you do not need the second contact. Your horns are wired up differently from a 65/66. I typed out a more complete explanation of how your horns are supposed to work here.
Veronica, you are very, very wrong. I will bet you here and now $1 that the stock 64 steering wheel requires a contact, the same contact found in the turn signal switch. Please stop thinking I am confused and believe him to have a 65-66 car. He doesn't, and I am not. You really need to look closer at the 64 horn setup.
The OP himself said the one in the wheel is missing. Without it, in the words of Monte Python, "you could put four million volts through it" and the horn still wouldn't work.
He can get the missing contact here-
2. The old wheel was a Grant woodgrain one. The wheel itself worked, the horn button never stayed on.
This is actually normal for a Grant. It is considered bad manners to say the word "pothole" while riding in a car with a Grant wheel, because the horn button will immediately fall off.