Sounds like all things aren't equal in the charging circuit. With that consistent behavior, one battery is always going bad before the other? Which one is it, the battery directly attached to the leads or the jumper'd battery?
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John
2016 Thor Hurricane 35C with pups Piper and Annabelle
2013 Ford Fiesta toad
FMCA - F457085
Blog - https://traversity.us
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