My 1984 745 has developed a problem which is driving me nuts. The left tail light is not operating. I have checked or replaced all of the obvious (bulb and socket, as well as the relay located under the rear seat) to no avail. What really stumps me is that my meter reads 12 volts at the socket until the bulb is inserted. As soon as the bulb is put in the socket the meter reads 0 volts.
I would appreciate any suggestions.