IDEA...charging house battery(set) underway.
It seems that the chassis alternator/VR system will often not fully charge the house battery(set) due to voltage drop between the two, or overcharge, boil the electrolyte away, for a deeply discharged...
Forum Discussion
Unless you marathon coast-to-coast in July a motor vehicle alternator voltage regulator will not overcharge the house batteries. Keeping the voltage drop extremely low between alternator and house batteries however IS NOT SIMPLE OR EASY to fix and this is the area you should be concentrating on.
