Sounds like you have at least one bad battery. As suggested above, disconnect all the batteries, each one from the set, and have them load tested to find the weak link in your set.
Now you'll have another hard choice to make, and that's rather to replace just the bad one/ones, or the whole set.
DTW
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Dan & Loretta, US Army Retired Aero Scout Pilot
2012 Fleetwood Providence 42P Class A/DP
Spartan Chassis, 8.9L Cummins 450HP
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