As explained before, the alternator can continue to produce 14V, but if there's a leak, it drains out of the battery, via the diodes. Diodes are only supposed to allow current to pass one way, like a one-way valve, that is how they rectify the alternating current (AC) to Direct Current (DC) for the battery to store. Once you switch off the engine, and the alternator, the full battery slowly drains back through the faulty diode(s).
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