There are two posibilities.. Your symptom list by the way is very good
1: Some coaches have a chassis battery "Disconnect" usually a switch (mine is an ignition interlock) that if it's turned off.. What you have is EXACTLY what I'd expect
2: Dead chassis battery
3: Dirty connection, Chassis battery
SOME coaches, mine for example, if you are plugged in the house charger also keeps the chassis up to full.
Many (Most?) this is not the case
In fact there are two after-market products to fix this
More expensive: Xantrex Echo Charge
Less expensive: Trick-L-Start
Since I do not have one I can not tell you if the Echo Charge is worth the added cost.. Both are simple 3 wire hookup.
Both do the same job
Oh and the phrase "All my 12 volt stuff works except for the radio" was very important
The Dash Radio, is either a "Switched" device (Switching between the house and chassis batteries under manual control) or a Chassis device on most RV's..
So the fact that the dash radio (Which by the way is one of the parasitic loads someone mentioned up-thread) does not work is significant.
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Home is where I park it!
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