u need to replace both bulbs
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.
Maybe a short somewhere...did you replace the flasher unit? No - it was blinking spuradically(?) - now I have to blink it manually and it won't blink at all with lights on.
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.
This is probably due to a faulty relay switch. The switch needs to be replaced so it will blink in the right timing.
Check your bulbs and your flasher.
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.
It has been my experience that a rapid turn signal indicates there is a burnt-out signal light bulb (either front or rear) on the side of the rapid blinking signal. If the right signal is blinking rapidly, the problem is in the signal lights for the right side (front or rear) of the vehicle. Turn the rapid signal on and step out of the vehicle to find which bulb is not lighting.
More than likely you have a burnt out bulb at the front signal light, rear signal light, or brake light on the right side.
That's usually an indication of a burned out bulb.
sounds like you have a bad turn signal flasher One bulb is bad. The right rear turn signal bulb is burned out
you need to replace the bliker can in the fuse box.
One of the bulbs is burnt out.