Last night my tail lights, brake lights & parking lights stopped working, but the license plate light still works. The rear turn signals work only when the foot is off the brake, but they are dim. The signals in front are normal with the foot off the brake, but will not flash with the brakes applied. I thought I blew a fuse, because the brake and running lights are on the same fuse. However, when I checked it, the fuse looked OK. I suspect there is a short somewhere. Does anyone here have any ideas?

The vehicle is my 1966 C-10.