cr0ft
Living Legend
The deluxe approach is to install a http://pdm60.com on the bike and hook the aux socket up to that. That also gives you multiple other switched (or unswitched, if you don't mind a 50 milliamp constant draw on the battery) power outlets. Heated gear, more lamps, what have you. A cheaper and old tech but still usable approach, though your total amp capacity goes from 60 to 30, would be a Fuzeblock http://www.fuzeblocks.com