No 12V DC or battery charge from generator

[Winterbagoal]

You're welcome. In post #2 I was thinking something to do with the inverter/charger mentioned in the Owners Manual on pages 6-3, 6-4, as they usually feed some of the coach AC outlets, when taking over for shore/generator power. Was not aware of the specific make/model type of I/C, so couldn't be more specific. Glad you got it sorted.

[Morich]

Great! Glad to hear it's solved and it does prove out one thing that we seem to lose track of at times.
It really does work better when we work together!

[Rick 99037]

It seemed in your comments, that you thought you needed to go to a site and plug in to a 30A plug to test your inverter. As long as you don't turn on a bunch of big draw things, just using your 20 amp to 30 amp AC plug adapter, which I expect you'd find thrown in the bottom of your power cord bay, in your driveway outlet will be just fine to provide enough amperage for this task. On a used rig like yours, I'd guess it might have also come with a 30A extension cord too. So pulling the full 15A or 20A available from your house plug in would be easy.
I've run my AC in this way, but found for instance that if I turned on the fridge too, while it's set to 120v, the 15 amp breaker lasted 30 seconds. Naturally, if you trip the house's breaker, you discover just how many other things were also running on that same breaker.