I must say that when I first got my M/H the control panel freaked me out. Battery condition as mine is called, has 3 neon lights, Red, Yellow and Green, otherwise known as traffic lights. Green light only comes on at full charge, ie 14.? volts (fully charged). Yellow light comes on at 13.?volts and charger kicks back in, but in the begining I thought that the yellow light meant 1/2 battery. A standing battery will drop from 14v (full charge) to 12.8 in a day, if not less, as that is a resting battery..in use, you should not allow the battery to drop more than 12 v or 11.8 at the most as this shortens the life of your battery.
The moral is. Is your battery being drained by phantom use or just resting. Only a digital meter will tell you the truth.