Alternators charge batteries.
BIMS connect two batteries (or battery banks) together when one side is charging and separate them when neither side is charging.
A BIM with an internal short MAY discharge a battery.
An Alternator with an internal short MAY discharge a battery.
Anything connected to the DC buss will discharge a battery if energized.
Anything connected to a DC buss MAY discharge a battery if faulty.
Does that answer your wide open question?
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Ted & Melinda
2016 ACE 27.1
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