Practice question

What does a high-frequency ripple pattern in an alternator's DC output waveform on an oscilloscope indicate?

  1. A normal charging system operating under full load
  2. A failed or shorted diode inside the alternator's rectifier bridge
  3. A slipping serpentine drive belt
  4. An overcharged vehicle battery

Answer: B — A failed or shorted diode inside the alternator's rectifier bridge

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