someone please help. I bought a stratos boat and it has two 12 volt batteries ran in series to a 24 volt trolling motor. How do I hook up a onboard charger and how many bank charger do I need to buy. Thank you in advance !!!
I disconnect the jumper between the 2 batteries when charging… I dont know if its neccessary, but I do.
If you have 2 batteries, you need a 2 bank onboard charge unless your going to manually switch the leads when one is charged.
Fisher Dave is right, I however do not remove the jumper wire. It works either way.
Ron
Most boat trolling motor batteries are under floors, or are generally hard to get to easily. a 2 bank charger will have a positive and negative lead for EACH of your 2 trolling batteries. run the leads from where ever you put the charger to the two batteries, there is usually enough wire to route about 5 feet of wire. I do not disconnect the lead from batt to batt. Place your charger where you can get to it easily to plug it in.
At least once a year, it is good to check the wires on your batteries, and clean them up with a wire brush and get any corrosion off.
good luck.
Jack..
I don’t disconnect the jumper either, not necessary. I would suggest that if you’re planning on getting an on board charger, get the 3 bank, and hook it up to your starting batt also! I wish I would have gotten the 3 bank in the first place! 
Quote:
I would suggest that if you’re planning on getting an on board charger, get the 3 bank, and hook it up to your starting batt also!
What he said! 
If you’re buying a charge…I’m jumping in line with a 3 bank. Keeping the starting motor topped off is a good thing.
I check the water on my batteries 4 times a year…along with the terminals. Checking the water a couple times during the hotter months.
Check with Uncle Wade at Jollyann Marine to see if that Minnkota 3 bank still has the $50. rebate. Even if it doesn’t no tax and free shipping is a good deal. The service is just frosting!
Merry Christmas! 
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