1. Accessories and Parts
  2. Hayes
  3. Trailer Brake Controller
  4. Wiring Adapter
  5. Plugs into Brake Controller
  6. Vehicle Specific
Custom Wiring Adapter for Hayes Brake Controllers - Dual Plug

Custom Wiring Adapter for Hayes Brake Controllers - Dual Plug

Item # HA81780-HBC
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Install your Hayes electric trailer brake controller quickly and easily with this custom wiring adapter. One end plugs into the controller, and the other plugs into the junction box beneath your vehicle's dash. Call 800-298-8924 to order Hayes accessories and parts part number HA81780-HBC or order online at etrailer.com. Free expert support on all Hayes products. Guaranteed Lowest Price and Fastest Shipping for Custom Wiring Adapter for Hayes Brake Controllers - Dual Plug. Accessories and Parts reviews from real customers.
  • All Info
  • Reviews (12)
  • Q & A (8)
  • Photos
  • Why etrailer?

Hayes Accessories and Parts - HA81780-HBC

  • Trailer Brake Controller
  • Wiring Adapter
  • Hayes
  • Plugs into Brake Controller
  • Vehicle Specific

Install your Hayes electric trailer brake controller quickly and easily with this custom wiring adapter. One end plugs into the controller, and the other plugs into the junction box beneath your vehicle's dash.


  • Plug-in wiring adapter allows for quick, simple installation of your electric trailer brake controller
  • No cutting or splicing required
    • Custom connector end plugs into the electric junction box beneath the dash of your vehicle
    • Opposite end plugs into the back of your electric brake controller
  • Compatible with time-delayed and proportional brake controllers from Hayes
  • Made in the USA

Installation of Hayes Brake Controller Adapter

To install your Hayes electric brake controller, you need to connect the wiring of the controller to your vehicle. Certain auto manufacturers offer pre-wired options, typically known as tow packages, in which the wiring is run for you from the dash to the trailer connector on the back of your vehicle. Usually when this is done, a port is installed at your dash so that you can easily plug in a brake controller.

Junction BoxBrake-Control Adapter Port

This adapter plugs into the port that is built into the electric junction box underneath your vehicle's dash. The black box is located to the left of the steering column, just above the carpet. To plug in the adapter, first remove the cover on the box. The adapter plugs into the second slot from the left, on the top row.

No hardwiring is required to install this adapter. After you plug it into the factory port, you simply plug the other end of the adapter directly into your electric trailer brake controller. Because there are no wires to connect, installation is not permanent. You can unplug and remove your brake controller at any time to transfer it to another vehicle or securely stow it away.

81780HBC Hayes Dual-Mated Brake Control Wiring Harness - Chevrolet, GMC, Cadillac, Hummer

Replaces 81780-HBC

This Product Fits The Following Vehicles

Customer Reviews

Custom Wiring Adapter for Hayes Brake Controllers - Dual Plug - HA81780-HBC

Average Customer Rating:  4.9 out of 5 stars   (12 Customer Reviews)

Install your Hayes electric trailer brake controller quickly and easily with this custom wiring adapter. One end plugs into the controller, and the other plugs into the junction box beneath your vehicle's dash.

- HA81780-HBC

Installation was easy, just plug and play. No issues so far. 711798

- HA81780-HBC
2006 Chevrolet Silverado

Instructions was very helpful and product worked on a Tow Smart Synchronize trailer brake controller. 692499

- HA81780-HBC

Perfect fit. Easy installation. 638017

- HA81780-HBC

Happy with the service I get from etrailer, and the fantastic selection of products. I spoke with both Paula S. and Odelia K. and they were very helpful and knowledgeable, and courteous. I am a kind of "old school" consumer and I like that you provide excellent phone support. One thing that would be helpful would be a mention right on the product web pages about why there are two seemingly identical listings for each product. Odelia said once one sends a product to the checkout basket then one is given reason for the two choices. It would be less confusing to have that reason in the preceding pages. Speaking of old school, this is the first time in my long life that I have installed a trailer brake controller and trailer light wiring without having to splice or cut anything. "New school" does have its advantages! Great store, thank you! 634054

- HA81780-HBC

The part fit great. Plug and play. Fanfic service and how to videos. Thanks. Bravo! 454709

- HA81780-HBC

I just had to plug it in to the fuse box, no wiring, just plug it in. 430880

- HA81780-HBC
2006 Cadillac Escalade

It fit and made the installation of the brake controller a snap. I would recommend it. 363350

- HA81780-HBC

Easy to install. 281148

- HA81780-HBC


- HA81780-HBC


- HA81780-HBC
2005 Chevrolet Silverado

I purchased this product and was very satisfied with how quickly they shipped my part. I will be buying more parts in the near future as I plan on building trailers out of my shop. 185369

- HA81780-HBC
Hyundai Genesis

My Genesis brake contoller s**t the bed. My Genesis was warrantied without a receipt, (thumbs up to Genesis), but did not include the wiring harness. My original Genesis did not have the "Quick Connect". I was going to try to use my original harness, but I did not want to chance burning out a new controller, because I wired something wrong. With the "Quick Connect" harness, your only problem is finding the right connection on your truck. (The harness will ONLY connect to the right position.) The "Quick Connect" harness saves much time and effort over trying to find the correct connections yourself. 156360


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Info for this part was:

Edited by:
Lindsey S
Expert Research:
Michael H
Updated by:
Laura H
Updated by:
Sarah W
Installed by:
Cole B
Written by:
Tammy D

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