I have solved the problem, it was in the fuse block. Having nobody to watch the tail lights, I set up a big mirror at 45-degree angle and only had to raise my head up from under the dash to check. Trying to be a MacGyver!
Hello, does anyone know what is the most likely intermittent connection in this taillights circuit? Is it 1) oxidation of the fuse block (spring connectors at each fuse end), or something within the headlight switch? - It is always BOTH taillights (the dim filament of the double-bulb). Brake...