How do the MH Diesel Engine Batteries receive their charge?

I have two 12v engine batteries on my diesel MH. I understand the engine batteries receive a charge when driving, but I have a few questions.

1. Are the two 12v engine MH batteries receiving a charge when I am plugged into shore power?


2. Are the two 12v engine MH batteries receiving a charge when I run the generator?


3. Can the two 12v engine MH batteries receive an overcharge? If yes, what would cause this (a bad board, etc.)?

I appreciate any help/advise you may have. Thanks.

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