Need switched power in rear of 07 400 max

I havee a rear backrest with lights and.handwarmets….I have the lights.figured out and they are.led so I’m going to attach them directly to the existing harness….the handwarmets are.a.different story thought. ..since ether draw.3.amps I don’t want to.attach them to the.twilight. …im looking for a 12v switched source in the rear.of a max that I can tap into.

Thoughts?