Checked the battery again this morning before I had to go run a quick errand....was showing 12.xx again not running. Just now, saw same result with the car off. Then I turned the car on. MM dropped to 9.xx when the car started and then jumped up to 14.xx. So it seems that the issue was at least partially the vanity mirror lights, since that's the only difference between pre-battery charging and post-battery charging.
Just got this in the mail today, though no instructions were included so hopefully I can manage to install without electrocuting myself.

Just got this in the mail today, though no instructions were included so hopefully I can manage to install without electrocuting myself.






