What would cause the dead battery. Brand new. I drove it home about 30 miles, amp gauge was good. Pulled the battery cables off for over night. This morning dead battery. Is this coincidence or part of the right brake light not working?

[img]http://www.imgur.com/hxlGUJt.gif[/img]
4-speed
3:54 Dana
13.01 @107.93 with street tires (not hooking up)