93' Venture Heated Visor Jack

[RockSteady]

Does anyone know how to install a visor heater jack on a 93' yamaha venture 480 w/electric start . I has the hand warmers. Can I tap into that?
Thanks
Ed

 

[watersuper]

Why not hook it up to the battery? No bad grounds to deal with.

 

[800]

blue wire at the light switch