Easy check - connect your voltmeter directly to the battery posts. You should see somewhere about 12.5 volts, give or take a little. Turn on the key while watching the voltmeter. It should drop a little, say a half volt, reflecting the current drawn by such stuff as running lights, fuel pump, electronic ignition and the like. If it doesn't drop at all the bike is drawing no current, and you have a problem in the bike, which could be the ignition switch itself or a broken wire. If it drops a lot, several volts, the battery is likely shot.