[Tiara Open] 2006 36' Cummins QSB. Batteries test good with load tester,but dont hold charge

[jclark003]

if your batteries are all charged, showing 12.5v then the problem is most likely in the wiring between the battery and devices. i would keep the load on and start working backward from where it is showing 10v and check voltage at each connection point. That your refrigerator and electronics both show low volts would seem to support a problem at or before breaker panel. So that is where I would start. If you show +12.5 then the problem is upstream in the wiring. If you show low voltage its downstream (disconnect switch, battery cables, etc)