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Which consequence follows from a blown charge warning bulb on such a system?

  • A.Overcharging
  • B.The alternator charges at a reduced output, which follows from the field receiving less current during operation
  • C.The alternator may fail to excite and will not charge
  • D.The lamp does not illuminate, which is the only consequence because the excitation is provided by the ignition switch

Answer: C

Without the lamp there is no excitation path and the machine never starts generating, which surprises many drivers. Some systems include a parallel resistor to guard against it, which makes the second option true of those designs. A symptom that appears under one condition and not another is what narrows the diagnosis quickly. The shared behaviour explains why these belong together and the differences explain why both exist. Framing the question as which quantity the change acts upon makes the answer follow without calculation.

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