So was it a whistling or a whining? You're talking about two completely different pitches, two completely different sounds. If you want us to help you, you have to be as precise as you can. If it was a whistling, I'm pretty sure that's something escaping out of the battery and that thing is now fuckered. As Don said, you've got bigger issues and unfortunately it's time to invest in a multimeter and start tearing apart the wiring harness, looking for frayed wires, shorted wires, something that shouldn't be connected to something else, something that shouldn't be touching something else, melted harnesses, disfigured harnesses, any of that. My best advice for you is to get an account on gixxer.com. get a service manual, and start reading. If you have something that's really stumping you (and us), ask the gixxer.com people since there are a hell of a lot more of them that have your model bike then there are here.