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Which purpose does the ballast bypass terminal on some solenoids serve?

  • A.Earthing the coil
  • B.Supplying the glow plugs, which are energised through the solenoid whenever the engine is being cranked to start
  • C.Supplying full voltage to the ignition coil during cranking
  • D.Supplying the fuel pump, which requires a higher voltage while the engine is being cranked from cold weather

Answer: C

A ballasted ignition coil is bypassed during cranking so it receives the full battery voltage when it is most needed. Fuel pump priming through the starter circuit genuinely exists on some systems, which makes the second option a real arrangement. A symptom that appears under one condition and not another is what narrows the diagnosis quickly. Working the distinction through on a single concrete case fixes it more firmly than any rule of thumb.

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