Today we rode for about 4 hours. I noticed the voltage reading was about 14.1 volts most of the ride for the for the first 30 min. I quit paying attention until after about 3 hours and then notice it kept fluctuating between 11.8 and 13.5 volts. It was not very consistent and changed every couple seconds. I would have expected it to stay around 14 volts while ridding kind of like my bike and car do. Should I be concerned? This was my 4th ride on it and this is my first atv.