Finally got around to investigating why the horn doesn't work on my '69 beetle - the earth wire from the horn has been cut by the previous owner! I assume this wire attaches to either somewhere on the outer tube of the steering column or thereabouts....? The horn rim earths the outer with the inner which is connected to the steering box...that's my take on it anyways! It's too dark to see now so I'll tackle it tomorrow.
--Steve