The amazing thing is, that I believe, that I have it seen in former days. But if you see anything everyday and it gets very common to you, then it's hard to describe, when it's gone. What colour of hair does your wife have? ;-)
My car is left as far as possible to factory conditions. But I have swapt the 350 engine to a 400 recently, but I did not do this myself.
And yes, the horn and the buzzer worked for years. I can't remember, when it stopped working, because I do not use both items all the time. And no, I did not test the horns (2) directly. Can I just take some wire from the battery to the horns?
The buzzer worked, when I had put the ignition in "accessory mode" (turn the key to the last position counterclockwise) and something was still on - maybe the light. But I do not remember this exactly.
I never thought of a worn ignition switch. I will wiggle and test, if that will change something. But will the buzzer also have influence on the horns? And I doubt, anything with the key will make it buzz, because this did not happen for a long time and it would have buzzed some day by accident.
The wires are all wrapped, so I will have to open the wrapping to follow the red wire. I will make some pictures of the compartment tonight.
I have seen some pictures with various locations of the relay. Some on the front wall next to the radiator, some at the firewall close to the brake … distributor(?). There ist nothing at the regulator and nothing at the brake distributor. The only thing I can see there, is some big connector going through the firewall. Are the horn wires going through this connector, too? I could unplug this and check the wire with a gauge from the horns to this Point. If there is a direct connection, there should not be a relay in between, or?