On older Par Cars the accessories are drawn from two of the eight six volt batteries.
This causes those two batteries to be drawn down and charged unequally.
Newer models are using a voltage reducer 48-12 volts and is connected to all eight batteries and feeds and supplies all accessories evenly.
You can have this device installed after you find out the condition and balance of all the batteries. This process is done by charging the batteries, attaching a discharge devise to the entire pack of batteries and after the discharge divice has completed the task a check of each battery is tested to find it's condition.
Obviously this test procedure is done by professionals and is time consuming, but usually
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