Actually got around to fitting the Moss Hazard Warning Light Kit I've been meaning to install for a while. Then found the horn wasn't working! As I hadn't needed to touch that part of the wiring so I was puzzled. Eventually located the problem to the fuse, the brass holder was a bit corroded where the fuse sits. A gentle clean with a precision file solved the problem. Fault finding was interesting, as there was no noticeable volt drop across the fuse, but that was with no current draw. The corrosion was just sufficient to drop the voltage enough to prevent the horn from working.

1956 Plus 4 4 seater