Just a guess.....
Could you have a bad cell in battery # 3.
Maybe if you disconect the batteries and try connecting a charger to just 1 battery at a time. The charger may tell you that one battery is bad.
Also......you might still have a "bad" connection on one of the batteries. Take the wires off and clean each connection with sand paper or wire brush.
Good luck finding your problem. An auto parts store could maybe test your batteries. You can buy a simple "eye dropper" looking tester to check the acid in each cell to see if it is charged up.....they only cost a couple of $$$.
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