Try this setup. Start with all the battery switches (house and chassis) in the "Use" mode. Start the coach engine but wait a few minutes then press and hold the "Aux Start" switch. Bring the engine RPM up slightly to get few extra volts out of the alternator but wait a few minutes. While still holding the Aux Start switch close try starting the generator.
The Aux Start will tie both the house and the chassis batteries together and works in both directions for either a low chassis battery or house battery. Waiting a few minutes while holding the switch will push some energy into the house batteries if they are the problem.
If your generator still won't at least turn over (engine spin) and only clicks as before you may have a bad starter, a bad starter solenoid, a bad power cable from the batteries or something as simple as loose or corroded ground points for the generator, battery bank or even the battery terminals. You can have good volts on the coach status panel but marginal grounds and cable connections will not allow for full power to pass which is what you need to turn the generator engine over.
Good luck and keep posting what you find or if there are any changes. And don't worry, together we'll get this fixed and you have a better idea how the different stuff works together so next time someone posts about a generator no start problem it will be your turn to offer suggestions.
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