[JimNNN]

I replaced the horn wiring and switch on my '54, but never on a '55.

Personally, I'd first hook the horn up to the battery directly and see if the problem is within the horn itself. I can't remember if my original '54 horns had adjustments on them or not, but they didn't work. I now have a 6v horn from some 1930's car installed...sounds kind of cute. BTW, has your car been converted to 12 v?

When installing the new horn wire from the top it will most likely be caught at that joint unless guided by a small pull wire or string that you connect to the old horn wire when you remove it.

dmsfrr's advice is very good. I did something like that when I rewired my '54 a couple of years ago. I was rewiring the entire car, and did the horn switch and wiring as part of my big project, but the horn prior to the rewire wasn't getting good contact. Don't discount your horn ring as being part of the problem either. I had to install a NOS horn button (my Mainline has a button instead of a ring) to finally get good consistent contact.