When you say the generator won't start, do you mean it won't crank?
The generator uses the house batteries to start, and I would say that the batteries are kaput as the fact that being on shorepower allows you to start the generator means you are starting it via the converter/battery charger.
The LED battery indicators are all but worthless. They are not precision enough, and they are also not accurate.
Do you notice any low-voltage issues with the house batteries when you turn on a lot of stuff; lights, water pump, etc?
The only way to truly get an accurate battery test is to do a voltage check after it has been disconnected and at rest for at least 1 hours, or to use a hygrometer/refractometer to check the electrolyte. Quite often it's easier to use a hygrometer than disconnecting the batteries.
Since you are new to this stuff, how long do you leave the coach on shorepower? Even with everything off, the house batteries can drain, so just sitting in your driveway can discharge the batteries over time - which is why many RV'ers keep their rigs on shorepower.
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