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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 If you check MOT historyof your vehicle and realise a previous MOT failed due to the lights not working, there could be two reasons for this. Are you aware that, according to an online MOT history checker, one of the most prevalent reasons for a MOT test failure is the lights? This is why you should check MOT status and have the problem fixed to avoid a failure. This could also be something simple as a blown bulb. If you look online for 'check my MOT history' and discover that your car previously failed the MOT test due to the lights not working, the relay or something as simple as a burnt-out bulb might be to blame.