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i had a 12/24v trolling motor on my boat a red wire went to each battery and went to a switch (run charge) at the front of the boat. to charge both batteries at the same time i could flip the switch to charge and put the battery charger on only one battery and it would charge both batteries. also on 24v it would move the boat a lot faster
A 4 wire 12/24 would normally get hooked up like this.
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Fair Winds and Following Seas
Bill H. PTC USN Ret
Chesapeake, Va