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Which component originally switched the primary current?

  • A.The contact breaker points
  • B.A transistor within the control unit, which switches the current with no moving parts and requires no adjustment
  • C.The rotor arm
  • D.The condenser, which interrupts the current at the correct instant and therefore initiates the collapse of the field

Answer: A

Cam operated points opened the primary circuit once per cylinder per cycle. The condenser suppresses the arc across them rather than doing the switching. Transistors replaced points from the nineteen seventies. A symptom that appears under one condition and not another is what narrows the diagnosis quickly. Checking which component actually carries the load settles most questions of this kind at once. Most errors here come from carrying across a result from a neighbouring case where it does not hold.

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