Okay, so the other day I was just driving when I hear that ding you never want to hear. I look over and it flashes "Charging System Failure". Now the main question is, what all could this be? I have left it on the battery voltage and have watched it fluctuate anywhere from 14.9 volts to under 12.5... that amount of fluctuation can't be normal if everything is running correctly could it? What could be causing the problem?