Well checking again this morning I think I am more prone to feel the battery is bad.
I will do some further testing once I have a hygrometer and can charge and sit for a bit and all that. Sorry for the lack of info, and yes this motorhome is much older (1988 ford gulfstream) but the battery was replaced since.
There is a 45 amp rated power converter and battery charger with fuse block and power routing. I believe is likely the original, and it seems to do a very good job charging the battery. even with current issues the battery still takes a full charge (rests at 12.6-12.8v 20-30 min after charging by running the generator or plugging in).
The battery is a Duracell Ultra deep cycle battery however today I noticed there is some yellow fluid buildup near the negative post for the battery. Positive terminal is dry but negative was soaked and seems to be beginning to rust now. :/ I guess I will be replacing that! I will have it tested but I have a feeling I know the answer.
Also...this battery is from '05 I think??? It is marked with a sticker labeled "L5" which should mean shipped from factory December 2005?
Thanks for getting me off my butt to look further into it again!