Discussion
Which charging voltage causes excessive gassing on a twelve volt battery?
Answer: B
The gassing voltage is around 14.4 volts and sustained charging much above it boils the electrolyte away. Regulators are set close to that figure deliberately. Sixteen volts would destroy the battery and the electronics quickly. A symptom that appears under one condition and not another is what narrows the diagnosis quickly. Most errors here come from carrying across a result from a neighbouring case where it does not hold.
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