I spoke with a Yamaha Rep they recommend to use the Blue+Red wire coming out of the fuse box for heated shields and acc. That way whatever you hook up is fused. Worse case you would blow the fuse for the blue+red wire, it won't shut you down, you only lose carb heaters, maybe grip warmers, and "convenience" items. You can still ride home.
Part of this was taken from the RX/RS Forum