Here's what I've got.
The alternator is a 110A Balmar with a Balmar MC-612 Regulator
There are a total of three batteries:
Two are Lifeline 4D 210AH, and one Lifeline Group 27 100AH. All three are gel batteries.
The battery configuration switch configuration is:
Position 1 4D & Group 27 in parallel
Position 2 4D
The monitor is a Xantrex Link 20
I don't have the info on the AC charger at this time. But I don't think that is important since I'm experiencing the same conditions.
Next time at the boat I am going to check the Link 20 configuration to be sure it was set properly in the first place.
Thanks for everyone's comments. Of course there are many opinions. I'll sort them out and see what happens.