One Side of the Turn Signal Lights Doesn't Work. ... You may be dealing with bad bulbs, a bad flasher relay, a faulty turn signal switch, or a bad wire or connector between the flasher unit and the turn signal switch. First, check the bulbs to see if they are still in good shape: No darkened areas or damaged filaments.

What do you do when your blinkers stop working?

Like any lightbulb, a turn signal will eventually burn out. If the bulb in your signal dies, then it's a pretty straightforward fix — simply replace it with a new one. Turn signal lights usually last a few years, but they can die quicker if you use them often.

What can cause turn signals to not work?

The usual cause of inoperative turn signals is a defective bulb or flasher unit. Prior to performing extensive diagnosis, check the vehicles fuses to ensure they are not blown. Some vehicles utilize two fuse boxes, one in the passenger compartment and another under the hood.