Not sure of your question? If you want to run a 12 volts system with two batteries you don't want to be in series you want to run them parelle. Both positive for each battery to the positive of the motor. Then both negative to the negative of the motor. To charge these batteries at the end of the day you will have a two bank charger, which will be hooked up 1# positive and negative to one battery and 2# positive and negative to the second battery.
I found this from another site.
http://www.nyc-arecs.org/Connecting_Batteries_and_Chargers_in_Series_and_Parallel.pdf
Thanks for the correction I use a 24 volt systems.

 

TB-Pg. six of your link says ONE 12 vt. charger to two 12 vt. batteries connected in parallel is preferred-and explains why. Thanks for the link, I usually scamper around for schematics each time I hook up a trolling motor to make sure I have the connections correct! It's in my Faves now.
"When batteries are connected in parallel, only use one charger."-quote.

 

Mike,

That is how you want it hooked if you are using a 12v motor. 24v will be batt 1 pos to batt 2 neg then use the batt 1 neg to the load and the batt 2 pos to the load. But I don't want to confuse you.

The one very IMPORTANT!!!! thing to know is that if you connect the batt 1 and batt 2 together as your diagram shows you must use caution. Here is why: If batt 1 has half a charge and batt 2 has a full charge electrons will rush to balance the pair. This can and will cause a flow of electrons that heat up your batt to batt connections and could cause a fire.

My suggestion is that you use a cole hersee switch or other brand batt. 1, 2 or both postion switch. Then you will use a batt isolator to charge from the motor or simply charge each batt by its self or with a dual batt charger.

I would not suggest a direct connection between two 12v batt.

here is the switch:

http://www.westmarine.com/webapp/wc...01/24867/377 710/0/battery switch/Primary Search/mode matchallpartial/0/0?N=377 710&Ne=0&Ntt=battery switch&Ntk=Primary Search&Ntx=mode matchallpartial&Nao=0&Ns=0&keyword=battery switch&isLTokenURL=true&storeNum=5002&subdeptNum=9&classNum=297