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Not sure what model alternator you have and here is the 200A dual-voltage alternator N1225-1 schematic & operation: From the schematic, there are two scenarios that would create the symptoms described: 1. If the 14V regulator would be driving the 15.4V, the whole stack voltage would rise to...

If indeed the overall stack voltage stays consistently at 28.4V regardless of what the 14V mid-point is doing then here is another scenario to consider. What it appears to be happening from what I read is that while the mid-point rises to 15.4V the other battery goes down to about 13V, which...