Heated gear should go directly off the battery terminals with their own fusing if smart.
most people just plug them on the 12v Cig outlet between the seats, they shouldn't but most do.
Heck i was talking with a gentleman the other day that told me in a very condescending way, "what do you know do you think you know more than polaris? , they designed it and put it there so it is safe to use"
I just shrugged it off and added that person to the "avoid when on rides" list.