Hope to hear some one experience this problem before I check out, today have a sunset course, after leave the dock notice the battery guagr below 12V, then climb up slowly to just over 12V, feel that not all right, later ,have a glance on it and find 0 voltage, check the alternator belt and breakers, it's ok, back to dock, measure the battery terminal with a tester while runing the engine, confirm that charge is ok but the guage don't move only, continue our wakeboard, on the way the guage move again, but indicate a lower voltage 11.5V, I know that's guage, for a fast check out,Would like to hear experience advice.