I've futzed around for 3 years trying to get the horn in my 69 to work. Took all the advice of my friends here at VFM...no luck. Took apart the horns, cleaned up the little plugs on the horns, made sure the horns have good metal to metal contact while mounted. removed and cleaned up the horn ring wires, etc. Still Nothing. DId it twice !?!? Nutin !
Yesterday afternoon I was cruising along NH rt. 107, and for some unknown reason I pressed the horn ring. HOONK...yup, it works *LOL* I have no idea why. Man, I've spent quite a lot of time on this, to no avail. Now, out of the blue, the darn thing works.
Who ever said these cars don't have a personality !!!
I had a similar problem with the turn signals on my 70 coupe. They worked fine til I turned on the headlights. Then, one day out of the blue, they started working. Don't look a gift horse in the mouth! Just accept that your horn works, and go from there.