Radio issues help!

So I got this new project truck and the aftermarket radio doesn't work. So I pulled the surround and it wasn't wired up. No big deal I thought. I've put tons of radios in tacomas of all varieties so this should be easy. Well 2 days later and two radios later, no luck. It's as if the radio is getting no power. I thought it was a problem with the radio itself so I went and bought a new pioneer today and still nothing. I'm 100% sure everything is wired correctly and I have checked the fuse. So my question is this. Where does that wiring harness come from? How hard would it be to just replace that and what should I search for online because all I'm getting is the install kit harnesses.

 

Time to get a meter and check for voltage.

 

Okay I can do that tm. I have the little crappy tester but it's telling me there is like 3 wires that are hot. I really just want to rip it out and start over because something is wrong between wherever it starts and where it ends