Bosch regulators run low
My experience with a number of different bosch units is that they rarely go above 13.1-13.3.Sounds like yours is towards the low end of normal.How are belts looking? I had trouble with a VW alternator several years back that was the result of a poorly tensioned drive belt.Circuit integrity is important as well.Cables and connections with high resistance will lower measured voltages quite a bit too.
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