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When connecting your battery, connect the positive (red) first and the negative (black) second. When removing the battery, disconnect the negative (black) first and the positive (red) second. Been doing this for nearly 30 years. ALWAYS connect the positive post first.
Use two 12-volt deep-cycle marine batteries and connect as follows: 1. Connect the BLACK wire from the trolling motor power cable to the negative (-) battery terminal of one battery (battery B). 2. Connect the RED wire from the trolling motor power cable to the positive (+) post of the other battery (battery A).