Why is my left running light and left tail light not turning off?

I eventually brought it in to the dealership, they ended up blowing water out of the light assembly for my left headlight and that fixed it. Hasn’t happened since then.

The taillights work not by supplying power to the light, but by grounding it. The light always has power to it, but no ground, so the car turns the light on by grounding a return wire.

That has the result that any short along that wire will turn the light on. Apparently Mikayla's was getting enough conductivity from the water in the assembly to complete the circuit, but generally it's going to be caused by a wire that's gotten frayed somewhere along the length and is touching bare metal.

So check the wires going to and from the bulb for shorts; that's the most likely cause. Of course, check the socket itself for any kind of damage as well.

I was wonder where should I take it to be fixed for a low cost I'm having this same problem?