I had the same problem awhile ago... I would rev my bike up and all gauges would shut off and headlight would dim down bad. I charged my battery for a few hours and that took care of the problem. Haven't had the problem again. It could also be a bad rectifier(sp?) Which is located on the left side of your cdi box mounted to the frame. It's a greyish color with cooling fins. Good luck! If it's your rectifier check out ebay, they sell them there cheap all the time.