I think I'm looking at new batteries.
I have a pair of interstate Costco 6v that are about 3 years old. We don't boondocks anymore and the trailer is at the ranch and hooked up constantly. PD9855 (?) does the charging. I did a SOC ...
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Are you still using the trailer, other than where it's parked now? IF not, or if never without hookups available, you may want to simplify to a single 12 VOLT rv/marine battery just to simplify.
