Cab lights installed on my sunroof Tundra !

I'm doing this. And I'm following this thread. I found a youtube vid with the complete drop of the headliner. i do have one question for the forum though.

Is there switched light power wire inside the cab on a gen 3 Tundra? The tail light fuse is under the hood. I can come in through the firewall if that's my best option. But I'm wondering about the optional tow mirrors, or other fancy mirrors with marker lights. Gonna check the door plug with a test light.

But maybe someone here has some insight.

Thanks for posting this thread. I don't mind drilling holes in the roof. I need the cab lights.