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Car encyclopedia

Relay

A relay is a device that allows a relatively small electrical current to control a larger current.

Symptoms of Wear or Failure

  • Components controlled by the relay will not turn on or off as desired

Related Repair Advice

  • A relay is commonly controlled by a manual switch or a computer. All electrical inputs to a relay should be checked for proper operation before the relay is replaced.
  • Using the incorrect relay on a computer controlled circuit may result in failure of the computer
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