Howdy brothers, I have a question for ya. I have an onboard charger that will charge two batteries. The trouble is I changed trolling motors from a 12v to a 24v so I now have 3 batteries 2 for the trolling motor and one for the motor. If I run some wire from the the positive to the positive and negitive to the negitive on the trolling motor batteries will this charge both batteries or will I have to charge one of them seperately? I have the charger hooked to my cranking battery and one of the trolling. I was just thinking if I hooked them in a series that it would charge both. What do yall think?