I'm likely just going to use a direct relay harness from the light...like this one. Power will come from the relay switch (connected to the battery).
Amazon.com: OPT7 Offroad Light Bar wiring Harness Kit (4 Items), 380W - Single Connector: Automotive
And then follow this... [MENTION=83083]rigtec[/MENTION] gives a great explanation.
http://www.toyota-4runner.org/5th-gen-t4rs/178040-opt7-leds.html
And this
http://www.toyota-4runner.org/5th-gen-t4rs/211802-wiring-lightbar-independent-harness-aob-switch.html
I have the opt7 harness and AOB switch and was originally going to use the hot wire that's powered and runs inside the cab.
I would prefer to use a switched power source instead of an always on source though. I doubt that I would inadvertently switch the light bar on and drain the battery, but would like to eliminate that possibility
