Coach battery charge

[Danny]

My LED shows full charge when engine is running but when I shut off the engine and put on battery disconnect and inverter LED says empty, what am I doing wrong.
The battery separates has stopped cycling after a two hour road trip. Are my coach batteries charged or empty??? Thx

[rvsprinterguy]

My guess is the coach battery(ies) is (are) bad. They're not holding a charge. I had the same situation before I replaced my coach battery.

[Boxster1971]

Those LED light just indicate the voltage. When the engine is running they will always indicate full as alternator voltage is about 14V. If you battery voltage drops that fast to indicate "empty" when you apply a load with engine off the battery are likely bad as rvsprinterguy mentioned.