Discussion
Which reading indicates an undercharging system?
Answer: B
A running engine should show at least 13.5 volts at the battery and typically around 14.2. A reading of battery rest voltage means the alternator is contributing nothing, which makes the last option a specific case of undercharging. Most errors here come from carrying across a result from a neighbouring case where it does not hold. The order in which the effects act is what decides the outcome, so it is worth establishing first. The quantity that varies and the quantity that does not are worth naming before any substitution is attempted.
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