Defective turn signal switch.
If you turn on your 1999 mustang v6 car and the right signal light stays on and doesn't blink and you switch the car off and then the left signal light stays on without blinking, then you need to see a mechanic.
the turn signal switch in the steering column
It means that a light bulb is out on the side where the light solid (not blinking) it could be in the front or rear of the vehicle.
That usually indicates that one or more of the bulbs have burned out. Turn on the left signal, get out of the vehicle and see which bulb is NOT turning on. Replace that bulb and the signal should work again. Also the flasher may not be working for one side.
Chances are good that the left turn auto return paw inside the steering columb is broken. If the turn signal handle doesnt automaticly return when you complete a left hand turn using the signal indicator before you start the turn then that sounds like that's the problem. Time to hit the shop.
u need to replace both bulbs
It sounds like you have a turn signal bulb burned out. I would turn the 4-ways (hazard lights) on and take a walk around the car to make sure all of the lights that are suppose to be blinking are.
One of the bulbs is burned out on the left side. The left front or rear bulb is burned out. Same problem with left side blinking rapidly and right side blinking normal speed. Both left side bulbs are lighting up, however?? Replaced both anyway and the problem still exists.
My 1997 Honda Accord was crashed into a snow bank, broke front left turn signal light(Bulb+assembly). Soon after the crash, the rear left turn signal began blinking rapidly. Several days after, the whole turn signal system shut down (all four blinkers stopped blinking). I replaced the bulb+assembly for the left, turn signal switch, and turn signal relay and checked the fuses. The hazard lights work, but the turn signals don't. I did everything I could replacing parts. Does anyone know what is wrong with my accord?
usually this is a bulb burned out on the left side
More than likely you have a burnt out bulb at the front signal light, rear signal light, or brake light on the right side.
Replace the signal flasher relay assuming you have physically seen front and rear, left and right signal bulbs flash.