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Which sequence does a pre-engaged starter follow?

  • A.Pinion meshes first, then the main contacts close
  • B.The main contacts close first, which spins the motor and therefore allows the pinion to engage while rotating
  • C.Both occur together
  • D.The pinion is thrown into mesh by the rotation of the armature, after which the main contacts close automatically

Answer: A

Engaging before applying full power avoids clashing teeth and is precisely what pre-engaged means. The last option describes the older inertia type, which engaged by rotation and was noisy and destructive by comparison. A symptom that appears under one condition and not another is what narrows the diagnosis quickly. Tracing the requirement back to the physical constraint that produces it makes the answer follow. Most errors here come from carrying a result across from a neighbouring case where it does not hold.

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