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Most ( no all) of the switches are make before break, the most reliable method is to have a switch for each battery ( wired to a third switch as an emergency combiner/isolator)the charging of each battery is acheived through an ACR or Isolator.. each battery having a single purpose... this cuts out the human error ..and need to switch back and forth... it is my understanding that blue seas ( and other manufacturers) now make a single switch that acomplishes this on it;s own.... I still like having the option of excluding one battery all together in case of an internal short...
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