My Xantrex "Link 1000" was in my boat when I bought it. It is designed to show me battery condition and energy consumption on one battery, however the instruction book says it will show me the voltage (only) of a second battery. Unfortunately, the instuction book doesn't tell you how this will be displayed. When I toggle through the choices using the "SEL" button, I get two voltage readings -- one steady and one flashing. Does anyone know which of these is the second battery voltage?