Only left rear lights out (brake, park, turn signal and backup)

[Billy918]

As title says… I have been unable to find a way to fix. Not getting power to any lights on left rear.

 

[DiabeticSith]

As title says… I have been unable to find a way to fix. Not getting power to any lights on left rear.

Have you checked the sockets for corrosion? My left rear went out yesterday. Cluster said parking light out, turn signal out. Pulled the bulb and the contacts were corroded. Socket was the same. Sprayed the socket with battery terminal cleaner and brushed the contacts. Installed a new bulb and back to normal. Still went and bought new sockets. Not sure what's causing the corrosion.