I reread your post. So you haven't got any data on how long they stay charged after tightening the loose connection?
Can you define "not holding a charge very long" . Is that with the disconnect switch on or off? There can be many parasitic loads on the house batts with them left in the on position but not using the coach.
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Richard Rhonda Ty and Alex Entrekin
1995 Newell # 390 DD Series 60, Allison World Trans
Subaru Outback toad
CoMotion Tandem
Often wrong, but seldom in doubt
Rhonda's chronicle https://wersquared.wordpress.com/
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