Well, I finally got my outboard to pump water, and it seems to be running very well. However, the battery does not seem to be charging. The purple wire in the harness that goes to the front is not hooked up to anything, and has 5-7 volts on it w/motor running. Is this for a volt or amp gauge, and does it need to be hooked up to get the system to charge? How much should it charge? I would think it would need 13-14 like a car to keep everything working. Thanks in advance.