I have a 1999 Sportsmna 500 that I just got done rebuilding. Anyways before rebuilding and after, while driving with the lights on at night after a couple of minutes of running, the lights and speedo just shut off for about 20 seconds then everything turns back on. The machine doesn't die or anything just the lights a gauge pod. Anyone have an idea of what it could be? it does it consistently. Could it be something like a loose ground somewhere or a stator problem? I'm lost here. Thanks.