no factory brake control harness

i have a prodigy3 controller and while poking around under the dash i found that my SR does not have a harness.i can hook up power thru a line with a inline fuse . the only hangup is where to attach the red line to brake pedal switch. i am not sure which to use.there is a brownish line with a stripe that i think is hot but the red,the black, and the blue are all real thin wires compared to wire on the controller . constructive advice appreciated. thank you

 

Yes, SR does not have it. It can be wired up, check etrailer website, they will often have install vids. Or, Im sure Youtube has some where folks added controllers.

And lastly, if you search this site (search box up top)....there may already be a write up with all the details on the install.

 

So there are several threads on this already. Here is one
https://www.tundras.com/threads/adding-trailer-brake-controller-to-sr.108436/

 

thanks very much,i will check it out