No power to brake controller

Sorry in advance if I screw this up, this is my first post.
I have a 2013 Tundra CrewMax Limited with tow package.
Trying to install my Tekonsha P-3, which was installed on my 2003 Tundra and worked fine when removed. It doesn't get any power, checked the wires, fuse under the hood, the fuses under the dash. On the truck side plug has 5 wires and the wire harness for the p3 has 4. I'm guessing the 5th wire isn't used on the p3, but it's the only wire I get power...its a small green wire. The black wire which is supposed to be the power wire has nothing. I even connected the trailer just incase for some reason there's a relay that energizes it, but nothing.
Anyone have any suggestions?

 

FYI, just incase someone else has this problem.
There are two 30amp Tow fuses under the hood. Tow BRK and Tow Tail fuses.
I must of checked the Tow Tail yesterday, because of what I read somewhere, that there was just one fuse under the hood. Anyway, I should have checked closer. It was the Tow BRK fuse that was blown. Replaced it and now my brake controller works.