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Which safety precaution applies when working on ignition systems?

  • A.Wear insulating gloves rated for the system voltage, which is required whenever the engine is being run for a test
  • B.None
  • C.Disconnect the battery before any test, which prevents the coil from producing the high voltage during the work
  • D.Avoid contact with high tension components while running

Answer: D

Thirty thousand volts gives a severe shock that can cause a fall or a startle injury, and it is dangerous to anyone with a pacemaker. Insulated tools and pliers for removing leads are the practical answer. Tracing the requirement back to the physical constraint that produces it makes the answer follow. The order in which the effects act is what decides the outcome, so it is worth establishing first. Working the distinction through on a single concrete case fixes it more firmly than any rule of thumb.

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