In my 02 Utopia 205 with the mercury 240HP Optimax engine. My Boat will not hold a charge. I just replaced the battery, and I can not get the system to hold a charge. When the engine is running it seems like I am getting output from the alternator. Which brings me to my question, there are 2 cables leading back to my battery terminals a dark green cable and a black cable. I have placed the dark green cable on the + terminal and the black cable on the - termial. I cant find these cables anywhere in the parts or service manuals. Anyone have an idea what these leads are for and what terminals they should connect to?