Hi @notreally ,
Does the instrument panel left turn indicator light work?
Can you hear the turn signal relay operating in the cabin when you operate the combination light/turn signal operating lever to turn left?
If you can’t when you operate it to turn left but you can when you operate it to turn right then you have a faulty turn signal lever switch or a wiring problem between the switch and the lamps.
Do the driver’s side turn signals work when you operate the hazards light switch?
If they do then you have a faulty turn signal lever switch.
If they don’t then you have a faulty wiring between the lamps and the signal turn switch or the hazard switch. I don’t know where the wiring runs to first from the lamps.
Here are two images that may help.
The first is the circuit diagram for the lights and the second is how to test the combination light /turn signal switch to check if it is OK.
(click on images to enlarge for better viewing)