I have an 1988 Nissan Sentra. The seal for the back window leaked and now the third brake light is not working. I changed one of the bulbs and when that didn't work, I picked up a third brake light from a salvage yard, and it still doesn't work. What now?
Check the fuse. Also check for rust inside of brake light, use wd40 to clean or fine sandpaper. If u have a multimiter (voltmeter) have someone press the brake pedal and measure that u get voltage in light baulb socket (between middle and outside shell).