1986 Ford F-150 Brake light and turn signal.

My left rear turn signal and brake light stopped working but my right side works fine. I replaced the bulb and it still did not work. I bought a new socket which has a red, black and white wires and the original are green with orange stripes, brown and gray. After trying all different kinds of combinations I still only get the tail light, not the brake or turn signal, the right rear works fine. S far as any fuses or relays they seem fine and look like one fuse and relay runs both sides. Help?
Thanks