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Which system decides how much the alternator charges on a modern vehicle?

  • A.The battery energy management system
  • B.The voltage regulator alone, which holds the output at a fixed value regardless of the state of the battery
  • C.The driver
  • D.The engine control unit, which raises the output whenever the engine is under a light load in order to save fuel

Answer: A

Energy management measures state of charge and health and commands the alternator through the engine controller, charging hard on overrun and little under acceleration. The last option describes part of that strategy inverted, which is why it tempts. A symptom that appears under one condition and not another is what narrows the diagnosis quickly. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision.

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