I have a Minn Kota MK 330D On-Board Battery Charger. There is a light for each battery, blinking orange(charging), blinking green(full charge), solid green(long term maintenance mode). I have one battery that stays flashing green and never goes solid green. I switched the the leads to see if the trouble followed the battery or was possibly a charger issue…the trouble followed the battery. Any ideas on what would cause this? What voltage should I have across the two batteries that are used for the 24v trolling motor and what voltage should I have for each individual battery if I isolate each battery?