67 Bonneville Horn

I've just discovered the horn is not working and would like to know if there's a fuse or a relay that powers it. I've checked my repair manual and it gives limited detail on the horn but not what to check or how to service if the horn should become inoperable. I've checked the fuse diagram and didn't see any place for the horn.

I don't drive the car much but when I do I'm reminded of the day I learned how important the horn is, especially in this era when drivers are so busy texting and everything else while driving without actually paying attention to driving and other motorist. Sitting behind a driver for about 18-25 sec at a red light after it turns green is not a good thing. It happening back to back is intolerable.

Sorry for the rant and thanks for your assistance in advance.

Ok step one do you have 12v to the horn when operating it, if not find the relay and see if you have 12v to and a grounded connection when operating the horn, if 12v in and the wire from the horn contact is grounding the relay then the relay is bad if no ground from the horn pad/ring then the contact in the upper column is the issue.