Turn Signal Lights

ck your turn signal switch wiring connector because it is more than likely has been hot and melted some connections.

Sounds like a bad turn signal switch. I bet if you wiggle the turn signal lever while you have your foot on the brake pedal the left and right brake lights ill intermittently work.

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You will have 2 flashers under the dash. First find the one that is clicking and you will see the other one close by. You can check the problem by removing the one that is clicking as its functioning ok because you have flashers working. after finding the other one switch them and you should have signals and no flashers. These will be located at the fuse block under the dash. Hope this helps you.

You may have a bad signal switch..Your brake lights run through the signal switch..Try hitting the brakes and move the switch around and see if your brake lights come on intermittently..

look for a bad ground to the right signal lights

check the front kick pannel for it or try this if and when you can get it to work listen for it clicking and that will tell you were it is

now when you say flashers work, I'm assuming you mean the 4 ways or Emergencys. As to the intermittent left signal working, I would first inspect both front and rear bulb sockets for corrosion and bulb condition. (Replace the Bulb, you can then rule it out). Clean and reinstall. If your problem persists, I would suspect your multi-switch contacts or connectors (Turn Signal Arm/Stick on the column)

Many cars have two flashers. One for hazard lights & one for signals. Check the turn signal flasher, if ok, check the turn signal switch. A wiring diagram will help a lot.

ASE mechanic here:
trying checking the turn signal flasher, the fuses, if all work fine, most likely cause is the multi-function switch.