At first it was starting to blink real slow when I would hit the left turn signal. Then after a day it is stuck lit on my dash. The signal lights themselves on the outside of the car are not stuck lit, just the indicator on dash. Put hazards on and they flash on both sides both on the dash and on the exterior lights. My question is, do I replace the flasher or replace the left turn signal bulb? I noticed front left bulb under the headlights is not working when I use hazards. I’m guessing the bulb is the problem and not flasher. Just want to check for confirmation before going through either path. Thanks.

Hazards use their own flasher, you can check if your flasher is bad by swapping them. I would go look at the bulbs and sockets, make sure they are clean and free of corrosion.