66 Dart steering column ground

When I first got my car the horn only worked when you turned the wheel to a certain spot. Turned out to be the steering coupler as the shaft ground runs through the coupler to the steering box and then to the frame for ground. I had to rebuild the coupler anyway and when I did the horn has worked fine since. Don't know if this is the same for you but you may want to check the steering coupler for loose play. Remember the steering shaft grounds the horn relay and not the column cover.