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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.
Connect the BLACK wire from the trolling motor power cable to the negative (-) post of battery B. 3. Connect the WHITE wire from the trolling motor power cable to the positive post of battery B. This will be your 12-volt lead. Include a 40-amp breaker on this connection.