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Which immediate action is required if a starter will not disengage?

  • A.Allow the engine to run, which will drive the pinion out of mesh once the one way clutch has released the drive
  • B.Disconnect the battery
  • C.Switch off the ignition, which removes the supply to the solenoid and therefore releases the pinion immediately
  • D.Continue driving

Answer: B

Welded contacts keep the motor powered regardless of the key, so the battery must be disconnected before the starter destroys itself. Switching off is the first thing anyone tries, which is why it makes such a plausible distractor. Working the distinction through on a single concrete case fixes it more firmly than any rule of thumb. Naming what changes and what stays the same is the reliable route through questions of this shape.

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