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A vehicle starts poorly each morning, the battery tests as sound after charging, and a parasitic drain of 400 milliamps is measured after the modules have slept.

Which conclusion follows?

  • A.A circuit is keeping something awake and must be identified
  • B.The battery has a faulty cell, which is discharging overnight and therefore causing the poor starting reported
  • C.The alternator has failed
  • D.The starter motor is drawing excessive current, which discharges the battery each time the engine is cranked

Answer: A

Four hundred milliamps is roughly ten times the acceptable figure and will flatten a battery in a few days. The battery itself has tested sound. Fuse by fuse investigation identifies the circuit responsible. The shared behaviour explains why these belong together and the differences explain why both exist. Tracing the requirement back to the physical constraint that produces it makes the answer follow. Reading the definition literally, rather than recalling a summary, avoids the usual confusion.

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