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Which measurement checks the free running current of a starter?

  • A.The voltage at the terminal
  • B.The resistance of the field windings, which indicates whether a turn has shorted within the winding of the motor
  • C.Current drawn on the bench with no load
  • D.Current drawn while cranking the engine, which indicates whether the motor is developing its rated torque

Answer: C

A bench test measures no load current and speed against specification, revealing tight bearings or a rubbing armature. Cranking current is measured on the vehicle and is a different test. Both figures appear in the data. A symptom that appears under one condition and not another is what narrows the diagnosis quickly. Reading the definition literally, rather than recalling a summary, avoids the usual confusion. Framing the question as which quantity the change acts upon makes the answer follow without calculation.

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