1999 Ford F-150 Back Brake Lights and Back Blinker Not Working?

Thanks to everyone for all the help on previous posts. I have traced this to the back after the wiring harness located behind the Rear Driver's side tire. When I put my tester I get the light blinking for both of the blinkers and a solid light for the brake lights, but they are still not working. I have blown out the connector, but still nothing. Took the white ground wire off and cleaned the connection to the frame. I cannot find any other wires or anything that seem to be a problem. Does anyone have a suggestion about what to do next? I have a trailer hitch connector on the back of the truck as well, if that makes a difference. Thanks for any suggestions.
 
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