Hello Les, my name is John White. I have a 2009 Hatteras 60 motor Yacht the system monitor is not working and I’m getting a lot of alarms. It was unplugged by the previous owner and I’m sure the internal battery has worn down and now it’s just black and the alarms go off all the time Gonna give you a call Monday to talk about this. My number is 48024 3 2407. My captain recommended you.