by clyde on Tue, 11 Sep 2018 2:28 +0000
Just to add to this thread for anybody else looking: The Redarc brake controller will not just recieve a brake signal in the red wire, but will also apply power out of the red 'brake signal' wire, to illuminate the trailer brake lights for the manual mode. This concerned me as I assumed that putting power back through the brake wiring may upset any ECU that's also using the signal. The other issue I was concerned with is the Toyota uses a 'trailer module' (usually mounted above the spare), so the trailer wiring is kept separate from the vehicle (one fuse in acc box).
I recently installed the Redarc TowPro Elite on my 2016 SR5, and fed the brake signal from the side of the brake switch as noted above, but I also used a diode to stop the Redarc from feeding power back through it. I've had no faults or codes show up on the vehicle with it wired this way. I am planning to run a second wire from the Redarc down to the trailer plug with a few more diodes so I'll have the trailer light feature working as well.