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Which test measures charging system performance on the vehicle?

  • A.Voltage at the battery with the engine running and loads on
  • B.Resistance of the stator windings, which indicates whether the alternator is capable of producing its rated output
  • C.A visual check
  • D.The current drawn by the field winding, which indicates whether the regulator is commanding the correct output

Answer: A

Measuring battery voltage at a fast idle with headlamps and blower on shows whether the system can meet the demand. Field current measurement is genuinely diagnostic, which makes the last option a real if more specialised test. Reading the definition literally, rather than recalling a summary, avoids the usual confusion. A symptom that appears under one condition and not another is what narrows the diagnosis quickly. A limit that survives making every external component ideal is an intrinsic one, and worth knowing for that reason.

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