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.

Why did my blinkers stop working?

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.

How do I know if my blinker relay is bad?

Turn Signal Relay Do Not Function The broken flasher is the most popular symptom of a bad turn signal relay. It can cause the lights do not function when you press the hazard light button. Although this problem may not lead to serious engine performance issues, it’s so dangerous when your turn signals aren’t working.