I just bought a new used boat and it has a 1997 30hp mercury on it. How do I know f it has a charging system. Its mode 30elo. I am sure I can test it somehow but I would like to know which components to look for. There are also a few wires on the back side that are not plugged into anything. Found a couple others that are capped. Any ideas? I will get a manual at some point but just trying to figure it out. Thanks in advance.