Alternate Battery Charging Method
If the combined voltage of all batteries reaches 36 volts or less, a safety feature in the on- board charger will not allow the charger to activate. Use the alternate charging method to add a small charge to each battery separately. The on-board charger will then activate properly to recharge all batteries to a full charge.
Use a 12-volt battery charger to charge 12-volt batteries. Charge each battery individually.
Use a 12-volt charger to charge 6-volt batteries. Charge in four groups, each consisting of two sequentially wired batteries.
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Set the battery charger to the medium amp setting (10 to 30 amps).
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Charge each battery for 10-20 minutes.
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Move quickly from battery to battery, as this is only a residual charge and it will dissipate in a short period of time.
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After charging the last battery, remove the off-board charger leads and plug the vehicle in.
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If the on-board charger does not recognize the residual charge and activate, repeat the alternate charging method.