Going from 12/24 to straight 24 volt.

I know how to wire the batteries. But I am not sure of my on board charger right now it is one lead to each battery. When I join the batteries together to make a 24 volt system do I keep both leads as they are? Seems to me they need to be changed. Thanks for any help.

You still keep battery charger leads hooked up the same....one bank to each battery.

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Exactly. If there is switch on the troller I would disable it or tape it on 24. Then no accidents.