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Realize that the voltage output of the voltage regulator in the alternator is dependent on the current draw. The alternator does not know if the current it supplies is going to the house batteries, chassis batteries, or any DC loads, all it knows is the DC buss is pulling X amount of amps.

So even though you may see 14.2 VDC on the DC buss, most of the supplied current is going to the DC loads needed to run the engine and motorhome. If the batteries are low, they will take more current. As the batteries' voltage increases, the current supplied to the battery decreases,