Where Is Brake Controller Install Wiring for 2021 Chevy Suburban

Updated 01/19/2026 | Published 01/26/2022

Question:

I cant seem to locate where my brake controller harness plugs into on my 2021 suburban rst with factory tow package. I had my whole under dash removed and I dont see any open ports to plug harness in or even loose wires to hard wire. I had dash off from steering wheel down.

asked by: Carl

Expert Reply:

I attached a picture of where you'll find the brake controller install wiring on your 2021 Chevy Suburban that you can use to install a controller like the Brake EVN # TK63VR.

expert reply by: Jameson C

Location of Wires for 2021 Chevy Suburban Brake Controller Install
(click to enlarge)

Eric

7/26/2024

E Trailer sent me a pigtail to plug in to my 2021 Chevy suburban where does it plug-in at?

Jameson C.

7/26/2024

@Eric Did you look at the picture above? That would be where to look.

Eric

7/26/2024

@JamesonC Yes I did, I had to order a different pig tail

Shaun C.

1/17/2026

@JamesonC - I also have a 2021 suburban and those wires are nowhere to be found under dash, below steering wheel or in the side with panels removed. I do however have a pigtail with those wires that I found in a bag in the glovebox. Would you please help - where does that pigtail plug end attach? Seems the brake controller loose wires have a plug - int which electrical junction box? Thanks in advance