Horn does sometimes works, sometimes not

[rasmeidirt]

#1 is bad relay, and rust.
rust in horn mount or any of those grounds seen above.
and any connection end to end, there.
that is normal for old cars, and using meter is the only cure , if new relay fails.
try a new relay first, as most folks do.
relays do in fact go intermittent, when old. and there contacts wear and burn.

Thanks. Does the steering wheel clock spring really exist?? I checked the two horns and removed them to test with 12v battery. They work!
You say the relay may be bad that is why it goes intermittent! I will try that.