Originally Posted by Herk7769
Now, when everything is working properly, the campground power should be charging both the house batteries and the starting battery.
In my experience, we've never had a unit that would charge the chassis (starting) battery when plugged into shore power. The isolator circuitry does the opposite - the chassis and house are disconnected when the engine is not running. Only when the engine is started, the circuits shown in many of the images will connect the house and chassis to charge both the chassis and house batteries underway.
When setting for long periods of time, none of the items hooked to the chassis should be running, such as the dash radio. Alternatively, a trickle charger can be connected to the chassis battery & plugged into shore power to keep the chassis battery charged while using those accessories.
As mentioned, press & hold the emergency start switch for a few moments, then while holding it, start the engine.
Running the chassis battery dead will significantly shorten the life of the battery. They only last 5-7 years as a rule anyway, but I've seen them die much sooner when run flat several times.