Practice question

Probing a standard 5-pin SPDT automotive relay, you measure infinite resistance (OL) across terminals 85 and 86. What does this confirm?

  1. The relay control contacts are stuck closed
  2. The relay coil is open-circuited (damaged or broken coil winding)
  3. The relay is functional and ready for service
  4. The internal suppression diode is shorted to ground

Answer: B — The relay coil is open-circuited (damaged or broken coil winding)

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