You may have a ground problem? The ground wire is black, you could try a redundant ground, see if it helps? You could also use a test lite and check voltage at applicable lamp, with turn or brake lites on. Your lower brake lites and turn signals should use the same bulb filament, just not at the same time. If I'm correct, your lower brake lites are wired through the turn signal switch, voltage.
SOURCE: 1995 GMC Sierra 4x4 - Having tail light problems
Most likely it is a groung issue where your rear wiring harness grounds to the frame. There may also be additional grounds for the wiring harness along the frame before the ground by the rear bumper. One other option is to make sure you have the correct bulbs in. I have seen something pretty similar to that caused by improper bulbs. Make sure your bulbs for the brake light/turn signal have dual filaments as that could be an indication you have the wrong ones; if you have the bulbs I think you do.
SOURCE: 1997 GMC Sierra p/u. Brake light & blinker out. Lamp & fuse ok.
you probably got the wrong bulb
those are usualy a different number higher wattage, they look exactly like an 1127 but are a 2027 or even a 3027 check the bulb base it has the number printed on it
SOURCE: 2003 VW BEETLE LEFT BRAKE LIGHT DOES NOT WORK WHEN
These cars were very well known to have bad grounds at the tail lamps. I would check the grounds to be sure they are still viable and check the wires to the tail lamps to be sure they haven't corroded.
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