Glad to hear your first trip was enjoyable, that's great!
Backing the TM up is a challenge, my DH does it pretty well most of the time and I'm the designated hand signaller, but my 12 year old likes to jump in and give some "advice" as well with his own made up hand movements, so I'm sure we give our camping neighbors a humorous show at times.
I am not proficient at all on most electrical/battery issues, but I'm learning more than I ever thought I would on this site. You'll get good advice about the issue you are having from others here, such as Texas Camper's response.
Continue enjoying your TM!