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Which symptom does a failed decoupler pulley produce?

  • A.Belt chirp and vibration, especially at idle
  • B.No charging at all, since the pulley is unable to transmit any drive to the rotor once it has failed
  • C.Overcharging
  • D.A loss of tension, which allows the belt to slip and therefore reduces the output of the alternator under load

Answer: A

A seized or worn decoupler transmits the pulsations directly and the belt chirps as the tensioner works hard. Complete failure to drive genuinely occurs when the internal clutch fails entirely, which makes the second option the end state. Naming what changes and what stays the same is the reliable route through questions of this shape. Tracing the requirement back to the physical constraint that produces it makes the answer follow. Framing the question as which quantity the change acts upon makes the answer follow without calculation.

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