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Which limitation does resistance testing of a coil have?

  • A.It cannot be performed on the vehicle, which requires the coil to be removed before any measurement is taken
  • B.None
  • C.It cannot detect an open circuit, which requires an oscilloscope in order to be identified with any certainty
  • D.It cannot detect insulation breakdown under high voltage

Answer: D

A coil can measure correctly and still break down at twenty thousand volts when hot. That is why a coil that passes a meter test may still misfire under load. Oscilloscope or spark testing is more revealing. Working the distinction through on a single concrete case fixes it more firmly than any rule of thumb. Reading the definition literally, rather than recalling a summary, avoids the usual confusion. The shared behaviour explains why these belong together and the differences explain why both exist.

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