This is obviously novice boat owner stuff. But I had to replace a trolling motor battery yesterday and made sure to note the cables and thought I had it all in my head just exactly how it went. Well when I go to hook everything back up I realize that I'm only on 12v and not 24v. So after trying almost every possible combination of crosswiring for 24v I found the right combo and just want to post it here for anybody who gets confused:
Run positive lead to battery A
Run Negative lead to battery B
Run jumper from negative Battery A
Jumper to Positive Battery B



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