Back in trouble again. Turn signals in rear now not working or brake lights. the one on top of the roof is working. What is going on? Have grounds to lights.

 

The front parking and turn signals light up and work but flash fast. When I pull on the 4 way flashers the front turn and parking unit flashes regularly. I ran another ground from the battery back to the rear lights. Now that makes no difference. There must be a problem somewhere up front? Running lights work properly in back and front also.

 

And the reverse lights work just fine so the grounds for the lights must be good.