Help please I looked through all previous threads with no solution.. left tail light no workSame bulb for brake turn signal work fine same with taillight in bumper and yes left rear side marker I'd put too, I have checked everything, any help here please...

 

Have you replaced the bulb itself, as it sounds like that is the problem the Parking (tail) light portion of the same bulb could be out and the Brake and Turn light would still work.

 

Yes absolutely that was of course my first move and when one is out I replace both right and left so all are new, I have traced the ground thinking it was that, I disconnected cleaned and sanded area for good connection and not that either, I traced all wiring to the connection block, disconnected removed the circuit board cleaned and all looks good, I even switched bulbs from left to right etc and no it's a left issue, my next move is to check voltage at connections but was hoping someone has been down this road and could offer advice . Thanks

 

Clean/May need to replace the socket!

 

How about testing with test light the plug end of the tail lights harness or switching the harness from right to left to test.