No power to right rear brack light Excurcion

Hi I having a problem with my 04 Excursion right brake light. yes the bulb is good i have no power I don\\'t have power to the trailer right rear brake light terminal ether I have checked all fuses they are all good I followed the wiring harness back as far as i could couldn\\'t fined anything wrong . Going on vacation soon please help thanks for your time. The drivers side and top middle brake light work as they should!

Any body??????