Do you want continuous, or key switch on only power?
The large cable from the battery terminal to the starter relay is continuously "hot," and capable of carrying maximum current from the OEM wiring. Also (generally speaking), the smaller-gauge WHITE wires in the loom provide continuous + 12 VDC power. Switched power? Look for a BROWN wire.
You may want to consider relays for power-hungry accessories, like heated grips and gear.
Good wiring diagrams (for Generations 1 and 2 (the latter, 2008 on) exist on the 'Net. The garden-variety automobile cigarette lighter plugs and sockets possess a tendency to separate from vibration and the rude shocks of rough surfaces; SAE and Powerlet sockets and plugs, not so much (adapters required to accommodate automobile cigarette lighter plugs with these).
“You better put down that gun. You got two ways to go, put it down or use it. Even if you tie me, you’re gonna be dead.” "John Russell" (Paul Newman), Hombre