Jeep 2005 left turn signal not working. all bulbs good

All bulbs good by what method>?
guessing?
bulbs can be good, bad or shorted,
testing them takes skills,
the flicker usually means that side is shorted.
remove all left bulbs, now put in just 1 new bulb. (not used)
work now. repeat, with other socket a new bulb.
Im not teaching how to test lamps ,ever, for 50 cent part.
can but wont.
if the blinker (turns) still fails. then find the short in the wiring
I always start at left rear.
looking for UHAUL trailer hacks there
then left front for collision damage not cured correctly.
see?
if still bad, then the whole left side wiring must be inspected
starting at sockets.
this is on all cars, made, but not 2008 up, on jeeps
on those you scan it first.