I'm having a charging system problem I think, at 3,000 rpm and above the volt meter will drop from 14 volts to 12 volts for a few seconds than goes back to 14. If I keep the rpms above 3,000 it will continue to fluculate. Below 3,000 it is fine. I have checked it with a volt meter, the battery is fully charged, but the voltage fluculation happens even when the bike is stationary. Any ideas.