i_drive_an_f150_w00t

So, when I use the signal on the driver side, the rear light will not blink. It works in the front, and both sides work on the passenger side.

I know this is a fairly simple problem and shouldn't be too hard to fix, but can anyone tell me what the cause is?

BLS

Bad bulb or socket maybe? Sometimes a bulb can look good or even be new but it still doesn't work. If not the bulb you need to test the socket out by sticking a test light in there in the bulbs place and see if it will flash for you when you turn the signal on. Hopefully that will get it. Good luck!