[Golfmedik]

Originally Posted by Dthogey

Aren't they always being charged when you're plugged in? Both times this happened I was plugged in. I would think the battery would be at full charge. Maybe I do have a bad battery

That is part of the problem with the marine batteries is that they are always charging. It may have a bad cell in it, or low of water or just a weak one. Sometimes the charger or the converter is what is bad. Take your battery cables loose and out a multimeter on them. You should have right at 13.4v on the positive cable. That would indicate that the charger is good. You can buy a 100A battery tester at Harbor Freight for around $20 that will tell you if your batteries are good or not. It will also tell you if they are weak. If you need to charge them, take them out and put on a bigger charger than the trickle type in the converter.