My RV lights were acting very crazy for 3 days, then got very dim. After looking allover for the problem, I got the idea of checking the battery (1). It was in the plastic tub filled with water to the posts. I went out and got a new battery and all was good till the lights started to get dim again but not acting crazy. Any ideas or suggestions would be greatly appreciated because I'm going to go nuts. This is all new to me but I removed the plastic tub. Is it possible that the new battery is not recharging ? Thank you !