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Hayes G2 Brake Boss Trailer Brake Controller w/ Mounting Sleeve - 1 to 4 Axles - Proportional
Universal Wiring Adapter for Hayes Trailer Brake Controllers

Part Numbers: HA81792BB,HA81789-HBC

Retail:$164.74

Our Price: $118.15

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HA81789-HBC - Universal Hayes Accessories and Parts
HA81789-HBC - Universal Hayes Accessories and Parts



Hayes G2 Brake Boss Trailer Brake Controller w/ Mounting Sleeve - 1 to 4 Axles - Proportional
part number: HA81792BB

Brake controller engages trailer's brakes in proportion to deceleration. Mounts with included sleeve within a 125-degree range. Easily adjust power output and braking aggressiveness. Includes digital display, audible alert, and manual override.

Features:

  • Brake controller activates trailer brakes in proportion to your vehicle's braking action
    • Automatically adjusts trailer's braking based on deceleration of tow vehicle
    • Activates immediately - no pausing like with time-delayed brake controllers
  • Automatically levels - internal sensor detects deceleration even if controller is not mounted flat
    • Position anywhere from -35 degrees to 90 degrees in the vertical plane
  • Adjustable gain setting lets you determine the power output sent to the trailer's brakes
    • Set to higher output when towing in hilly terrain or with a fully loaded trailer
    • Back off power when towing a lightweight or empty trailer
  • 4 Boost settings let you adjust initial braking power and aggressiveness
  • Large, easy-to-read LCD screen communicates brake power output, boost settings, and error codes
    • High-resolution screen is glare resistant
  • Easily accessible adjustment buttons let you change settings
  • Built-in safeguards protect your vehicle and trailer
    • Audible alert warns driver about wiring continuity problems
    • Manual override illuminates brake lights on tow vehicle and trailer
    • Current limiter protects vehicle from shorts in the trailer wiring
    • Hazard flasher immunity prevents pulsing of the brakes when flashers are activated
  • Bottom-mounted, slide-style manual override
  • Quick and easy installation
    • Plug-in, vehicle-specific brake control adapter (sold separately) can be used for certain applications to reduce installation time
  • Mounting sleeve attaches to tow vehicle's dashboard with 3M VHB tape - no drilling required
    • Allows the brake controller to be easily removed for storage or for use in a different vehicle
  • Made in the USA


Specs:

  • Application: trailers with up to 4 axles (8 brake assemblies)
    • Designed for use with electric or electric-over-hydraulic brakes
  • Mounting position: between -35 degrees and 90 degrees in the vertical plane
  • Dimensions: 5" long x 3-1/4" wide x 1-1/4" tall
  • Limited lifetime warranty


Proportional Braking

With a proportional brake controller, you can get heavy-duty emergency braking, general braking, or slow-to-an-idle braking for your trailer automatically. The intensity with which your trailer brakes are activated and the rate at which they are applied are dependent on the deceleration of your tow vehicle. This means that, unlike time-delay controllers - which send the same amount of preset power to your trailer brakes every time - proportional controllers are able to adapt to every braking situation differently.


So, if you slam on the brakes in your truck, your trailer brakes will activate with that same extreme intensity. And if you merely slow down as you approach a red light, your trailer will gradually brake in the same manner.


As long as the Brake Boss is properly mounted according to the included instructions, the controller will automatically level, sense the tow vehicle's deceleration, and adjust the trailer's braking. The result is uniform braking across your towing setup. No push-pull action - just smooth, proportional braking every time.


Built-In Controls on the G2 Brake Boss

G2 Brake Boss Controls

The diagram above shows the controls and components of the Hayes G2 Brake Boss electric trailer brake controller.


Power Output Control

The power output control lets you set the maximum amount of power that will be applied to your trailer's brakes. Typically, the power output is only readjusted if you switch from a heavy, loaded trailer to a much lighter, empty trailer - or vice versa.


During the installation setup process, use the adjustment buttons on the front right side of the G2 Brake Boss controller to adjust the power output. To get more power to your brakes, press the "up" button. To decrease the power output, press the "down" button. The output can be raised or lowered in 5-percent increments.


Power Boost for Heavy-Duty Towing

The Hayes G2 Brake Boss also offers a boost feature that gives you more initial braking power for those times when you're towing heavy loads or a larger trailer. You can switch boost levels so that the power output to your trailer brakes automatically starts out at a set percentage of the predetermined power setting.


If you're towing a heavy load, sending out more initial power to the trailer brakes - and causing them to reach maximum braking faster - allows you to better control the trailer so it doesn't push your tow vehicle before coming to a complete stop.


To set the initial power, press the menu button and select from one of the available settings. (B0 is 0 percent, B1 is 5 percent, B2 is 10 percent, B3 is 15 percent, B4 is 20 percent.) The higher the setting, the more aggressive the braking will be. Hayes makes the following recommendations for which boost setting(s) to use with your towing setup:


Approximate Gross Trailer WeightBoost SettingIncrease in Initial Power Output
Much less than the tow vehicleB0 or B10 percent or 5 percent
Less than the tow vehicleB210 percent
Roughly equal to the tow vehicleB2 or B310 percent or 15 percent
Slightly greater than the tow vehicleB3 or B415 percent or 20 percent
Much greater than the two vehicleB420 percent

Digital Display

The G2 Brake Boss features a large LCD display where the brake type, power output, boost settings, alarms, and diagnostics are shown. You can set the color, intensity, and contrast on the display.


While braking, the display shows the amount of power going to the trailer brakes as a percentage of the total available. You can change this display to show voltage or amperage during trailer set-up or when troubleshooting problems.


The Brake Boss will display the word "Warning" when it senses problems, and it will help you troubleshoot these problems by indicating the following: Output Short - No Brakes, Overload - Excessive Amps, No Trailer, or Blue Wire Fault - Voltage Present. The controller will deliver an audible alert when these warnings display, unless you choose to turn it off.


Slide-Lever Manual Override

The manual slide lever is located on the bottom of the unit. To activate it, just pull the lever forward. The manual slide lever overrides the preset power output and allows the operator to engage the trailer brakes without using your vehicle's brakes. In addition to being a necessary safety feature, this option helps to control trailer sway by slowing the trailer to put it back solidly behind the tow vehicle.


You can also engage the manual override to help you move a sliding 5th-wheel hitch closer to your truck's tailgate for tight maneuvering during slow speed turns. Just apply the manual override to hold the trailer in place while slowly moving the tow vehicle forward.


Installation and Wiring

G2 Brake Boss Mounting Angles

Because this controller operates with an internal inertia sensor, it must be mounted between -35 degrees and 90 degrees in the vertical plane. The G2 Brake Boss must be mounted on a level horizontal (side-to-side) plane and must be lined up with the direction of travel for the internal sensor to function properly.


The Brake Boss comes with the Hayes Quik-Receiver. The Quik-Receiver is a mounting sleeve that attaches to your dashboard with 3M VHB tape - no drilling is required. With the Quik-Receiver you can easily remove the Brake Boss for storage or transfer it to another tow vehicle. A replacement wiring harness (sold separately) and a replacement Quik-Receiver bracket (sold separately) are required to move the controller from one vehicle to another.


Installation of the G2 Brake Boss requires that you either purchase a custom wiring adapter designed to plug into the controller or that you hardwire the controller directly into the vehicle. To hardwire the Brake Boss, you must remove the plug at the end of the integrated wiring harness.


Installation Accessories

The Hayes vehicle-specific, dual-mated wiring adapter is available for most newer trucks and SUVs with tow packages. One end of the custom adapter plugs into your vehicle's brake controller port, and the other end plugs into the controller - no hardwiring required.


Hayes also offers a universal wiring harness (HA81789-HBC - sold separately) that plugs into the back of any Hayes brake controller. The 4 leads on the universal harness can then be hardwired into your vehicle. By splicing the universal adapter into your wiring instead of directly connecting the brake controller to your wiring, you gain the ability to unplug and remove the controller from your vehicle should the need arise.


Notes:

  • If a custom brake-control wiring adapter is not available for your vehicle, one of the following will be required:
    • 20-Amp circuit breaker (9506P - sold separately) for 2-brake applications
    • 30-Amp circuit breaker (38630 - sold separately) for 4- to 6-brake applications
    • 40-Amp circuit breaker (9510 - sold separately) for 6- to 8-brake applications
  • If you're hardwiring the controller, it is also suggested that you install an in-line fuse between the controller and the stop light switch (required on 1999 and newer Fords).

See also etrailer.com's exclusive 7- and 4-way brake control installation kit (ETBC7 - sold separately) if you don't already have a 7-way plug at the back of your vehicle.



81792BB Hayes G2 Brake Boss Electric Brake Controller w/Bracket - Proportional





Universal Wiring Adapter for Hayes Trailer Brake Controllers
part number: HA81789-HBC

Designed for applications that do not come equipped with a brake control wiring harness port from the factory, this adapter plugs into your Hayes electric trailer brake controller at one end and the other end splices into your vehicle's wiring.

Features:

  • Universal wiring adapter provides a quick-disconnect for your electric trailer brake controller
    • No need to cut the plug off the brake controller to wire it directly to your vehicle
    • Makes it simple to plug and unplug controller for use in a different vehicle or for storage when you're not towing
  • Wire end splices into your vehicle's wiring
    • Use on a vehicle that does not have a factory tow package or is not equipped with a plug-in port
  • Connector end joins with the plug on your electric brake controller
    • Compatible with time-delayed and proportional brake controllers from Hayes
  • Wire length: 24"
  • Made in the USA


Installation of Universal 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. However, if no port is present, you will have to splice into your wiring.


With this universal adapter, you can install your Hayes brake controller without having to wire the controller directly to your vehicle. If your vehicle has a factory tow package, just splice the pigtail end of the adapter into your vehicle's factory brake control harness wiring, and then plug the other end of the adapter into the controller. If your vehicle doesn't have a factory tow package, you'll have to hardwire the pigtail end of the adapter into your vehicle's wiring. Because only the adapter is hardwired to your vehicle, you can unplug and remove your brake controller at any time to transfer it to another vehicle or securely stow it away.


If your vehicle is not equipped with a factory tow package, you will need to purchase additional equipment to ensure that the signals from your brake controller are sent to your trailer's brakes. We recommend etrailer.com's exclusive 7- and 4-way brake control installation kit (ETBC7 - sold separately).



81789HBC Hayes Universal Pigtail Brake Control Wiring Harness

Replaces 81789-HBC





Video of Hayes G2 Brake Boss Trailer Brake Controller w/ Mounting Sleeve - 1 to 4 Axles - Proportional


Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.




Video Transcript for Hayes Brake Controller HA81792BB Review

Today, we'll be reviewing Part Number HA81792BB. This is the Hayes G2 Brake Boss Trailer Brake Controller with Mounting Sleeve for 1 to 4 Axles. This brake controller is going to activate your trailer brakes in proportion to your vehicle's braking action. That automatically adjusts the trailer's brakes based on deceleration of the tow vehicle, and it activates immediately, so there's no pausing like with time-delayed brake controllers. It also has automatic leveling. It has an internal sensor that detects deceleration even if controller is not mounted flat. You can position this anywhere from 35 degrees to a 90-degree angle in the vertical plane.

Here on the front, it features adjustable gain settings that let you determine the power output sent to the trailer's brakes. That way, you can set it to a higher output when towing in hilly terrain or with a fully loaded trailer, or you can back off the power when towing a lightweight or empty trailer. It also has 4 boost settings that let you adjust initial braking power and aggressiveness. Has the easy-to-use push buttons here on the front, as well as a large, easy-to-read LCD screen that's going to communicate the brake power output, your boost settings, and the error codes. It has a high-resolution screen, so it is going to be also glare-resistant. Again, it has the easily adjustable and accessible buttons that let you change your settings. This system also features built-in safeguards that are going to protect your vehicle and trailer when it comes to safety.

It has an audible alert that warns the driver about wiring, continuity problems. It also has a manual override that illuminates the brake lights on the tow vehicle and trailer. It has a current limiter that's going to protect the vehicle from shorts in the trailer wiring. It also features hazard flasher immunity that's going to prevent pulsing of the brakes when flashes are activated. That manual override is here on the bottom, and its just a nice, easy-grip slide system. This is made from a dependable solid-state construction. Its a pretty quick and easy installation.

You just plug this in. Hayes does offer vehicle-specific, brake control and adapters that are sold separately that can be used for certain applications to reduce installation time. It features this nice mounting sleeve that attaches to your tow vehicle's dashboard with a 3M tape that's already on there, so no drilling is required. It allows the brake controller to be easily removed for storage or for use in other vehicles. This is designed to be used with trailers with up to 4 axles or 8 brake assemblies. Its designed for use with electric or electric-over-hydraulic brakes. The dimensions.

This is going to give us a measurement of 3-1/4" in width, about 5" in length, and 1-1/4" in height. It also comes with an alcohol-prepped cloth. That way, you can clean off your service before you peel off the adhesive and mount this to your dash. That's going to do it for today's review of Part Number HA81792BB. This is the Hayes G2 Brake Boss Trailer Brake Controller. .



Customer Reviews

Hayes G2 Brake Boss Trailer Brake Controller w/ Mounting Sleeve - 1 to 4 Axles - Proportional - HA81792BB

Universal Wiring Adapter for Hayes Trailer Brake Controllers - HA81789-HBC

Average Customer Rating:  4.8 out of 5 stars   (13 Customer Reviews)

Brake controller engages trailer's brakes in proportion to deceleration. Mounts with included sleeve within a 125-degree range. Easily adjust power output and braking aggressiveness. Includes digital display, audible alert, and manual override. Designed for applications that do not come equipped with a brake control wiring harness port from the factory, this adapter plugs into your Hayes electric trailer brake controller at one end and the other end splices into your vehicle's wiring.

- HA81792BB

by: RonnieMX08/12/2016


First of all I'd like to say kudos to e-trailer for getting a brake controller and wiring to my house in Vermont from their place in Missouri overnight. I was shocked when It got here so fast, they saved my vacation. I really like the Hayes brake controller it works very well and is predictable. It's also very easy to set up once it's all connected. It was a breeze to install particularly on my 2006 Nissan Titan, it was two plugs, and stick it on the dash, and I was done. The only thing I need now is a bigger better truck to pull my 8000 pound trailer up to the speed limit, never did make it. The Nissan is a bit week for the job and it overheated a couple of times on hills and I had to turn on the heater to drain extra heat and bring the temperature back down, no AC allowed. But the trip went well nonetheless. My next truck will be diesel with dual wheels four-wheel-drive, no monkeying around next time. Thanks e-trailer! I'll be back to get my gear for my next truck from e-trailer for sure?? 283092



- HA81792BB

by: Mike S03/24/2015


The Hayes G2 was very simple to install in my 2012 Ram 1500. The two sided tape did not hold for me, probably the cold temps up here in upstate NY, but I was able to use the included screews to secure the cradle. The bundled wiring adapter made the installation plug and play, so much easier then the old pigtails and electric tape. The factory default of 50% power and 10% gain should be about what I need to handle my nearly 3000 lb (fully loaded) pop-up but I will be able to fine tune that once I am able to have a proper test drive. I am very pleased with this controller so far. Can't wait for our first trip of the season! 180578



- HA81789-HBC

by: Jerry M06/30/2016


Product arrived in good condition packaged very well as always great service and quick response.Will be buying from E-trailer again. Was able to find a replacement connector for my Hayes brake controller. Thank you keep up the good service. 266706



- HA81789-HBC

by: Bob P.04/10/2016


Made the installation a breeze and allows for the plug and play of the controller when I need it as opposed to the permanent installation of a brake controller in my other pickup. 243612



- HA81789-HBC

by: Jack P.01/20/2017


This product makes installing the brake controller so much easier, because I use this unit with multiple tow units it is nice to be able to unplug and move to the other vehicle. 333930



- HA81789-HBC

by: Dave W03/09/2015


etrailer.com delivered as promised. Fast friendly service. Product arrived quickly as was exactley what I needed. The how to video was spot on. Thanks, Dave W. 177657



- HA81789-HBC

by: Bruce H05/31/2015


Very pleased with product. Better than the factory of same product. It arrived before estimated date and installation was easy. 199138



- HA81792BB

by: kent09/23/2017


Good install info. Easy hook-up. Plan on hauling hay tomorrow so will give it a good test. 435785



- HA81789-HBC

by: DAVE12/22/2016


Works great with the Hayes brake controller. Makes older vehicle installation a breeze. 327406



- HA81789-HBC

by: Brad03/03/2016


Product quality and function is every bit as good as expected. 239352



- HA81789-HBC

by: bill w03/26/2016


Fit good shipped fast thanks good peopl e. 241820



- HA81792BB

by: Jon01/10/2017


Came quick, just as ordered. 331554



- HA81789-HBC

by: Jon01/10/2017


Came quick, just as ordered. 334694


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Ask the Experts about this Brake Controller
Do you have a question about this Brake Controller?


  • Troubleshooting Trailer Brakes That Intermittently Lock Up With any Brake Pressure
  • Sounds like the problem is on the trailer's wiring as the issue you are having has shown up with two different tow vehicles. The most likely situation you have is that your brake light circuit is shorting out to your brake output circuit which is causing your trailer brakes to apply fully when the brakes are applied. Do you notice the brakes applying or locking up when the blinker is applying as well? If so, that blinker circuit on your trailer wiring is shorting to the brake output
    view full answer...

  • What Angle Does the Hayes G2 Brake Boss Have to Be Installed at for Proper Function
  • The Hayes G2 Brake Controller part # HA81792BB has to be installed in a specific angle range otherwise the proportional sensors of the controller will not accurately be able to sense braking activity and apply the correct amount of braking power to the trailer. If the controller being totally level and squarely facing the rear of the vehicle it is 0 degrees, then 94 degrees would be slightly past totally vertical and -35 degrees would pretty close to the middle of facing directly at
    view full answer...

  • Parts Needed to Install Brake Controller On 2008 Hyundai Veracruz
  • To install the Hayes Trailer Brake Controller # HA817922BB, you will want to use the Hayes Universal Wiring Adapter # HA81789-HBC. This pigtail will splice into your vehicle. The white wire needs to be grounded. The black wire will connect to the battery. The red wire goes to the stoplight wire. The blue wire is connected to the trailer connector at the rear of the vehicle. You will also need a wiring harness for your vehicle if you don't already have one. I recommend the Tow Ready
    view full answer...

  • Troubleshooting Output Short Message on Hayes G2 Brake Brake Boss Controller part # HA81792BB
  • The message you are seeing on your Hayes G2 Brake Controller part # HA81792BB indicates that there is a short on the brake output circuit of the brake controller. Since it is showing this code with the trailer disconnected that would mean the problem is on the truck like you suspected. Commonly this is due to corrosion on the trailer connectors. This can be fixed by hitting the connector with some fine grit sandpaper. Aside from that you will need to trace the wiring from the brake
    view full answer...

  • Brake Controller Port Location in 2016 Ram 1500 Laramie
  • Often a brake controller connector will be tucked up pretty high and out of the way, and sometimes it will even be taped to other wiring or other components behind the rear side of the dash. It can definitely be hard to spot them sometimes. There may be a foam wrap or cap on the connector to protect its electrical contacts. The vehicle's trim level, such as the Laramie edition, generally does not affect internal components like wiring parts.
    view full answer...

  • Troubleshooting Brake Controller Install that Activates Vehicle Brake Lights When Connected
  • Sounds like the wiring of your Hayes G2 Brake Boss Trailer Brake Controller # HA81792BB needs to be checked. Can you verify that the black wire of the controller is ran to a 12 volt power source, the red to a circuit that only sees voltage when the brakes are applied and the blue to the output circuit of your 7-way? The white should also be grounded but since your controller is coming on it sounds like that circuit is properly connected.
    view full answer...

  • Is Hayes G2 Brake Boss Trailer Brake Controller HA81792BB Made in the USA
  • Yes, the Hayes G2 Brake Boss Trailer Brake Controller # HA81792BB is made in the USA. In comparison to the Draw-Tite I-Command # 5535 (which is not USA-made) the Hayes allows for a wider range of installation positions, anywhere from -35 degree to +90 degrees in the vertical plane. The Draw-Tite requires a slightly tighter installation range of -20 to +70 degrees. Both work with electric and electric-over-hydraulic brakes on up to 4 axles and both are covered by a limited lifetime warranty.
    view full answer...

  • Hayes G2 Brake Boss Trailer Brake Controller Recommendation for a 2011 Jeep Grand Cherokee
  • Yes, you can install the Hayes G2 Brake Boss Trailer Brake Controller w/ Mounting Sleeve # HA81792BB in your 2011 Jeep Grand Cherokee. The connector should be mounted on top of the emergency brake bracket, it's gray in color. Once you find it all you need to do to install this controller is plug the Custom Wiring Adapter for Hayes Brake Controllers # HA81796-HBC into the port under your dash and then plug the other end into the # HA81792BB, mount it, and you'd be good to go.
    view full answer...

  • Fit of Hayes G2 Brake Controller # HA81792BB on 2004 Ford F150
  • A brake controller isn't a vehicle-specific item, so the Hayes G2 brake controller you mentioned, part # HA81792BB would work just fine. You would need a wiring adapter, part # HA81783-HBC that would plug into the rear of the controller and into the connector located under the vehicle dashboard. As you can see in the provided photo, the brake controller is located behind the OBD port under he steering column. It's located above the OBD port and to the right.
    view full answer...

  • Installing Hayes Energize III Brake Controller on 2012 Chevrolet Silverado
  • To install your Hayes-Lemmerz Engerize III 81741B in your 2012 Chevrolet Silverado, you will want to use the Hayes Universal Wiring Adapter # HA81789-HBC. This universal adapter will need to be hardwire installed for your Silverado. Hayes does not offer a wiring harness that will plug into the brake controller port under the dash, if your truck has one. I have attached a help article on installing a brake controller in a 2007-2013 Silverado for you. This help article will walk you
    view full answer...

  • How to Install and Remove the Connector on Hayes Universal Wiring Adapter # HA81789-HBC
  • The Hayes Universal Wiring Adapter # HA81789-HBC that you referenced is intended to plug into the back of a compatible Hayes brake controller such as their Genesis # HA81790 and then hard-wire to your vehicle using the 4 wire leads. The plug portion on the adapter is not intended to mate with any connectors on your 2007 Dodge Ram 2500 Pickup. There are other brands of brake controllers that do use adapters with plugs on both ends, one for the controller and one for the vehicle, such
    view full answer...

  • Trailer Wiring Harness to Install Hayes Brake Controller on 1996 GMC K1500
  • For the Hayes Energize XPC brake controller the wiring harness that connects into the wiring of your 1996 GMC K1500 is # HA81789-HBC. It needs to be hardwired into your truck with the black wire going to 12 volt power, white to ground, the blue goes to the rear of your truck to power the trailer brakes, and the red connects to the stop light switch which is the wire coming from the truck's brake pedal connector that is hot only when the pedal is pressed. You can test this with a circuit
    view full answer...

  • Wiring Adapter for Hayes Lemmerz Energize III Brake Controller on a 2012 Chevrolet Suburban
  • The adapter you are looking for is the # HA81789-HBC. This universal harness will need to be hardwire installed for your 2012 Chevrolet Suburban. Hayes does not offer a wiring harness that will plug into the brake controller port under the dash, if your vehicle has one. I have attached a Help Article on installing a brake controller on your vehicle for your convenience.
    view full answer...

Info for these parts were:

Edited by:
Lindsey S
Expert Research:
Jameson C
Expert Research:
Adam R
Updated by:
Laura H
Installed by:
Cole B
Written by:
Tammy D
Photos by:
Zach O
Updated by:
Sarah W
Updated by:
Jenny M

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