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Which test distinguishes a bad connection from a bad starter?

  • A.Measuring the battery voltage during cranking, which falls if either the battery or the starter is at fault
  • B.Voltage drop measurement along each part of the circuit
  • C.A resistance measurement of the cables, which reveals any additional resistance introduced by a poor connection
  • D.A visual inspection

Answer: B

Measuring the drop from battery positive to starter terminal and from starter body to battery negative while cranking isolates the fault. Ohmmeters cannot resolve milliohms. A low battery voltage during cranking is ambiguous. Working the distinction through on a single concrete case fixes it more firmly than any rule of thumb. Checking which component actually carries the load settles most questions of this kind at once. Most errors here come from carrying a result across from a neighbouring case where it does not hold.

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