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The relay is an electrical device that controls the lighting by acting as a switch. According on the vehicle's specific needs, they come in a range of shapes, sizes, and designs when current is given to the relay, the circuit within cuts on and off, resulting in the relay clicking sound and the turn signal or danger lights blinking.
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3 Symptoms of a Malfunctioning or Faulty Hazard/Indicator Relay While flashers are a basic component in both design and function, they play a significant part in a vehicle's overall driveability and can jeopardise safety if they fail. If you check MOT history of your vehicle and realize a previous MOT failed due to the lights not working, there could be two reasons for this. Either the bulb(s) had blown, or it was a faulty relay. To confirm this go through any previous repair invoices (if available).