2005 Gem Charging system

Hi, I have a 2205 Es gem, bought it used , and do not have manuals with it , I have charge all 6 batteries w/ the master off ,then plugged in on board and turned master on, there is lights on the side of the charger, ,just been an hour, but the first light is on (red ) and the second light is dim ( green) , ? like to know what I am looking at ?? , @nd, does the charger make any noise when working properly??Help