No problemo...but it illustrates the flawed cable configuration in so many boats. The charge and load sides of the electrical system often share a common cable. In my boat it was the start cable from the battery to the starter.
If you can separate the charge from the load, you have better control over each. I send my alternator charge directly to my battery banks via dedicated cables. The loads are carried through separate cables to the distribution panels, busses and the starters. If one battery bank needs help, the other battery bank can be combined via switches to share the load. This does not combine the charging from the alternators which continue to provide their charges to their respective batteries.
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