What does the ground inside hatch right rear quarter provide ground to?

 

84s also there is a grommet for side marker wiring missing blowing dirt directly on ground connection.

 

Ok, I removed the ground and connection was filthy. before I removed it, I checked fuel pump ground with a meter and found high resistance, removed ground and still have a reading of the same high resistance. Maybe my ground is grounded. Anyway, this may be the cause of my running rough onder load as in fuel starvation. Who knows, Guess I will see when I go through the harness, repair the fault, and run it again.