I am having a problem with my 07 Mean Streak 1600. It has 30,000 miles. During my last two rides the tach and speedo has been bouncing to zero and back at random. I have not been able to find any shorts. It will only happen after a short ride not while idling in the garage. The charging system is only putting out around 12.04 volts. Could this be the problem? Any help will be appreciated.