Duncan,
Our 8351 chassis battery discharged like yours. With hindsight, it seemed to occur at shorter & shorter intervals of nonuse. My dealership service department "investigated" several times to find "nothing wrong"; scolded me for mistreating the battery (typical answer for everything). With a lot of noise from me (squeeky wheel) & words of wisdom from the factory, the battery was determined to be defective & replaced on warantee (with a cheap brand, of course).
Think about this: The chassis is 1 year older than your model year RV built on it. A case could be made that the battery has sat activated, discharged, outdoors (perhaps frozen), for up to 2 years before you took delivery. A defective battery is not surprising.
I HAVE learned to hit the disconnects when our coach is going to sit for any time & have never had the discharged problem since. Do remember, that if you discharge your chassis (engine) battery, calmly start your generator (It uses the coach or house batteries). It will charge your dead chassis battery thru the "Intellitec IRD Relay". I think you have to depress the "Auxiliary Start Switch" on the dashboard. You may be able to start the engine off the house batteries without the generator using this switch, but if you run those down, that's it. Start your generator first, then the engine. The engine alternator will provide a rapid recharge to the engine battery.
whew... sorry about all the long-wind again.
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