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.

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

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

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Deck the Halls
With tools and Fix Kits
Use a knife to cut the tape away from the wire and unravel it.
  • 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.
  • 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.
  • 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.

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

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 - Reply

Finish Line

6 other people completed this guide.

Lauryn Johnson

Member since: 01/19/2016

257 Reputation

1 Guide authored

2 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. - Reply

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 - Reply

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