2005 mercury sableJuly 7, 2014Left rear brake light not working, all other lights working corectly. Keywords:Brake Lightleft rear brake light problem.LightsSable 1 thought on “2005 mercury sable” Freeautomechanic July 7, 2014 at 8:13 pm My first thought would be replace the light bulb. Try swapping it with the other side and see if the issue follows the bulb…. get a new bulb. Check for power and ground at the plug and trace backward if it is not there and correct the wiring. Comments are closed.