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Which measurement checks a high tension lead?

  • A.Resistance along its length against the specification
  • B.The voltage at the plug end, which requires an oscilloscope and is the only meaningful test of a lead
  • C.A visual inspection
  • D.The insulation resistance to earth, which reveals whether the lead is tracking to the engine along its length

Answer: A

A lead is measured end to end and compared with the figure per metre. Insulation testing genuinely reveals tracking and is a real check, which makes the last option a valid additional test rather than a wrong one. Reading the definition literally, rather than recalling a summary, avoids the usual confusion. The order in which the effects act is what decides the outcome, so it is worth establishing first. The shared behaviour explains why these belong together and the differences explain why both exist.

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