Kirk,
Thanks for the tips.
Sadly, I'm not near the RV where I can get to this right away, In fact it won't be for over a week (and that's if I can sneak out to the RV while everyone else is prepping for Thanksgiving!).
Yes, I have Class C RV with an internal generator.
Great idea on checking the house lights with simply the house batteries.
I'll write back in a week or two, when I know more.
Sincerely,
Keith