If you had a remand golf cart built and they did not supply you with a 48-12 volt voltage reducer you could have that type of condition.
Your cart was most likely originally built with a 16-12 volt reducer. This design draws off only two batteries for all the items on the cart that use 12 volts.
The two batteries that are used are typically run lower then the rest in the bank of batteries and therefore run behind in the charging process and after years use can cause an inadequate charge to all six batteries.
On all our remands that we build we always use a correctly installed voltage reducer to avoid the type of problem you are having. These days most good cart MFG's include them as a norm.
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