I have one reverse light that does not work. I have inspected the bulb and the filament appears fine. It can't be the reverse light switch (the other brake light works)s, and my boot cables are in good condition (besides, they should not effect the reverse light). I am thinking perhaps that despite the appearance of the bulb, it may be defective or perhaps there is a loose connection of the reverse light wire to the taillight assembly.
Any ideas?