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Which check distinguishes a battery fault from a charging fault?

  • A.Measuring the current drawn during cranking, which indicates whether the battery is capable of supplying the starter
  • B.Measuring the charging voltage with the engine running
  • C.Measuring the open circuit voltage after a rest, which reveals whether the alternator is charging the battery
  • D.A load test only

Answer: B

A charging voltage of around 14 volts at the battery clears the alternator and directs attention to the battery. A rested reading tells you the state of charge but not why. Both measurements are made, in that order. The shared behaviour explains why these belong together and the differences explain why both exist. The order in which the effects act is what decides the outcome, so it is worth establishing first. Checking which component actually carries the load settles most questions of this kind at once.

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