Will Adapter 4-Pole to 7-Pole and 4-Pole Connect To Brake Output Circuit on 2013 Toyota Tundra

Updated 09/29/2025 | Published 05/15/2025

Products Featured in This Question

Universal Installation Kit for Trailer Brake Controller - 7-Way RV and 4-Way Flat - 10 Gauge Wires

(3448)

$124.27

Question:

My truck only has a factory 4-wire flat. Is the wiring for the trailer brake circuit blue included from this controller to the 37185 7 pole adapter included?

asked by: Dana

Expert Reply:

Hi Dana; does your 2013 Toyota Tundra have the brake controller port under the dash? If it does, you can use the # TK77ER along with the # 37185. There will be factory wiring, including the brake output wire, you can splice the # 37185 into at the rear. If you do not have the brake controller port or the factory wiring to splice into you need the # ETBC7 to upgrade to a 7-way, along with the # 90195 with the universal wiring harness. If you have any other questions feel free to reply below.

expert reply by: Robin H

Brake Controller Port on 2013 Tundra
(click to enlarge)

Robin H.

9/29/2025

Hey Dana, did you find the brake controller port under the dash of your Tundra? I'm curious if the solution worked for you because it could help others in a similar situation.