I have the Sprinter chassis as well, and that 14.1 or 14.2 volts you see reflects to some degree the state of your house batteries. I see mine at that same voltage sometimes even a 14.3 volts, while driving, but it always drops down into the mid to low 13 volts as the batteries charge up. Charging from the converter off shore power, I never see 14+ volts, the highest will be 13.7 or 13.8 volts, and drops to 13.2 or so as the batteries charge up.
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