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Which alternative current path appears when an earth strap fails?

  • A.Through the exhaust system, which is mounted on rubber and therefore isolated from the body of the vehicle
  • B.Through the throttle or clutch cable, which may glow red
  • C.Through the fuel line, which is insulated and therefore carries no current under any circumstances at all
  • D.None

Answer: B

Starter current will find any path to the body, and cables and pipes have been melted by it. It is a real fire risk. The exhaust is a genuine partial path on some vehicles despite the rubber mountings. Tracing the requirement back to the physical constraint that produces it makes the answer follow. Most errors here come from carrying across a result from a neighbouring case where it does not hold. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision.

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