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Which earth path does the starter current return through?

  • A.The starter mounting bolts only, which conduct the current into the gearbox casing and thence to the body of the vehicle
  • B.The chassis rail
  • C.The negative battery cable connected directly to the starter body, which provides a dedicated return for the current
  • D.The engine to body earth strap

Answer: D

A heavy braided strap between the engine and the body carries the starter return, and a corroded one produces slow cranking. The mounting bolts do carry current, which makes the second option part of the real path rather than an invention. The order in which the effects act is what decides the outcome, so it is worth establishing first. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision.

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