Sprinter/Winnebago Navion electrical issue

[SteveBuckeyeFan]

8 year old Navion on Sprinter Chassis just started acting up electrically. Everything works electrically when plugged in to shore line, but when unplugged, all "coach" electronics are dead, both 12 volt and 110. Batteries are fully charged. Engine running. If I plug back in to shore power, everything works!? All fuses seem fine. Thoughts?

 

[T’sOVR&Explore]

You described symptoms suggesting that the ac powered converter supplies 12 volt but the battery does not.

Could just be an end of life lead acid battery that gotz nothing left to give, or a BMS cutoff event if it is a LiFePo4 battery. If the battery checks out good, go looking for a blown maxifuse or dc circuit breaker close to the coach battery.

If the main DC fuse is blown or breaker popped open, you will need to figure out the cause.. Good Luck!