How to Activate 12 V Aux Power in a 2007-2014 Chevrolet Suburban

Written By: Lauryn Johnson
  • Comments: 13
How to Activate 12 V Aux Power in a 2007-2014 Chevrolet Suburban

Difficulty

Easy

Steps

6

Time Required

20 - 30 minutes

Introduction

Even though 2007-2014 Chevrolet Suburbans come with a trailer tow package, the manufacturer has neglected to connect the wire that enables the 12-volt auxiliary pin on the 7 pin connector. This technique allows tail lights and blinkers of any tow-behind trailer to be powered by the vehicle. It will also power any other appliances that may be in the trailer such as refrigerators or microwaves. This is an easy fix that may cost $75-100 for a professional to execute.

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    • Locate the wiring harness bundle, which exits the firewall underneath the brake booster.

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    • Identify the auxiliary wire, which is folded and taped to either the wiring harness or the fire wall.

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    • Use a knife to cut the tape away from the wire and unravel it.

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    • Run the wire against the battery box.

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    • Place the ring terminal (washer end) of the wire on the right post located at the front of the battery.

    • Place the 10 mm washer on the post.

    • Tighten the washer using a 10 mm wrench, crescent wrench, or pliers.

    • Post size and location may vary slightly in different models. The washer will fit snuggly around the correct post.

    Y'all may want to say that it takes a m6 bolt to lock it down.

    Grayson Judd -

    What is the left post for? It is constant hot as well, at least on my truck. Can’t seem to find anything showing which fuse feeds it.

    Robert Abraham -

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    • After hooking up the wire, check to make sure the 40 amp fuse is installed for the auxiliary pin.

    • If the fuse is not installed, there will be an empty space. This fuse can be purchased at any automotive shop.

    It’s not a break booster, it is a brake booster. If you are going to be an author, you should know the meaning of the words you use.

    Albert -

    I’m sure it was a simple mistake. There’s no need to talk so tough cyber warrior.

    nshourds -

    THANK YOU! I scratched my head for a week trying to get this auxiliary working….after I found your information on this sight. it took less than 5 minutes to hook it up (would’ve only took 2 minutes, but I had to go back and clean the wire terminal end…then it worked!)…..and another sight on the internet wanted me to pay them 5 bucks for this same information! So, again, thank you very much!!!

    darrelwt -

    What is the purpose of the other terminal, next to aux power connector?

    Rhohon -

    Stud 1 and stud 2 are for. Trailer brakes 30A fuse, stud 2 12v Aux power 40A fuse. At least for my GM vehicle. 2009 Escalade. My model had both fuses in place but the studs not hooked up. Your model may have a fuse, no fuse, or even a dummy fuse like a dust cover in place. Also for this model all trailer lights are isolated and have their own fused.

    Trailer left running 15A

    Trailer left brake turn 15A

    Trailer right running 15A

    Trailer right brake turn 15A

    Reverse lights 10A

    Trailer brakes Stud 1 30A

    12V Trailer Aux Stud 2 40A

    Thomas Madison -

Author

Lauryn Johnson

Member since: 19/01/16

454 Reputation

6 comments

This sends constant power to the trailer. What if I wanted to make that power switched by the ignition so when the key is off I can be confident that the trailer won't kill my truck battery? I know I can just unplug the trailer harness or pull this fuse to stop it, but That might be easy to forget to do.

Eric Wonderlich Jr. -

Eric, did you ever get an answer to your inquiry about killing the power to the trailer when the key is in the off position?

Bobby Burke -

It’s not a break booster, it is a brake booster. If you are going to be an author, you should know the meaning of the words you use.

Albert -

Never fails some troll somewhere..

Garry Foster -

“Words have meaning” geez Cyber Warrior. Tough talk from a distance. ?

nshourds -

What thread pitch of nut is it for the terminal stud.

Kenny Man -