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It reads 12.7v and 14.8v when charging? Yes, that is possible if the batteries are out of balance. (Different states of charge) It's also potentially damaging to the batteries because the alternator's regulator only understands that it needs to output 28.8V, and if one batt has a low state of...

Just FYI, it's not possible to discharge only one battery because they are wired in series. A parasitic drain will draw from both batteries. If one battery is discharging, but not the other, it's due to self-discharge of that battery, meaning the battery is bad, not the alternator.