Hayes Engage Trailer Brake Controller - 1 to 3 Axles - Time Delayed
Custom Wiring Adapter for Hayes Brake Controllers - Dual Plug

Part Numbers: HA81760,HA81787-HBC

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Hayes Engage Trailer Brake Controller - 1 to 3 Axles - Time Delayed Automatic Leveling HA81760
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Hayes Engage Trailer Brake Controller - 1 to 3 Axles - Time Delayed
part number: HA81760

Brake controller engages your trailer brakes with a preset intensity when you apply the brakes in your vehicle. Power output and braking aggressiveness can be easily adjusted with built-in buttons. Includes digital display and manual override.


  • Brake controller activates trailer brakes with preset intensity
    • Signal is sent to trailer brakes when tow vehicle's brakes are activated
  • Adjustable power output lets you determine the amount of power 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
  • Power ramp time setting lets you adjust the aggressiveness with which the brakes are applied
    • Get full power output faster by choosing a low setting, increasing activation speed
    • Achieve smoother braking by selecting a higher setting, supplying power gradually
  • Easy-to-read LED display communicates brake power output, ramp setting, and error codes
  • Easily accessible adjustment buttons let you change settings
  • Built-in safeguards protect your vehicle and trailer
    • 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
  • Slide-bar manual override
  • Dependable solid-state construction
  • Quick and easy installation
    • Can be mounted at any angle in any plane, and in any direction
    • Mounting bracket and hardware included
    • Plug-in, vehicle-specific brake control adapter (sold separately) can be used for certain applications to reduce installation time
  • Made in the USA


  • Application: trailers with up to 3 axles (6 brake assemblies)
    • Designed for use with electric or electric-over-hydraulic trailer brakes
  • Dimensions: 5" long x 3" wide x 1-1/4" tall
  • Limited lifetime warranty

Time-Delayed Braking

The Hayes Engage brake controller applies your trailer's brakes when the brake pedal in your tow vehicle is engaged. Every time you apply the brakes in your vehicle, a signal is sent - via the brake switch - to the Engage. The controller then sends power out to your trailer brakes to activate them with an intensity set by you, at a rate determined by you. Both the amount of braking power (output) and rate of application (ramp time) can be adjusted to suit your preference, the road conditions, type of trailer, and size of the load. To determine the amount of power that is best for your application, you must test out your towing setup and choose what feels best.

A time-delay controller is so named because there is a delay between the time that you initially apply the brakes in your tow vehicle and the time that the controller reaches the set maximum power output. Unlike a proportional brake controller, which activates your trailer's brakes based on the deceleration of your tow vehicle, the Engage sends power out in the same way, with the same user-set delay, no matter the braking situation. Although this delay always exists, it can be adjusted by changing the ramp time setting. The controller will continue to send out power to the trailer brakes as long as your foot is on the brake pedal, even when your truck and trailer have come to a stop.

Built-In Controls on the Engage

Engage Controls

The diagram above shows the controls and components of the Hayes Engage 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 initial setup process, use the adjustment buttons on the left front of the Engage controller to adjust the output. To view the output setting, press either button and release. The output setting will appear as a percentage on the digital display - from 10 to 99. Use the plus and minus buttons to raise or lower the setting in increments of 5.

Power Ramp Time Setting

Power ramp time is the elapsed time from the point that the brakes are first applied to the point that the set power output reaches its maximum. This setting is responsible for determining the aggressiveness of the braking action.

To adjust the ramp time, press the minus button until the display flashes, then release. The power ramp time (1-5 seconds) will flash. Use the minus button to cycle through the options. When the desired ramp time is reached, press the plus button to select it.

If you want to reach maximum power output faster, choose a lower number. To get smoother braking action, select a higher number, which will supply power to the trailer brakes more gradually. You can alter this setting to suit your driving preferences or to improve handling based on changing road conditions or varied trailer loads. The digital display will only show the ramp setting as you adjust it. After a few seconds, it will revert back to display mode.

Digital Display

The Engage brake controller features an easy-to-read LED screen that displays the power settings as you adjust them.

While braking, the display shows the amount of power going to the trailer brakes as a percentage of the total power available. You can choose to change this display to voltage or current during trailer set-up or when troubleshooting problems. When the brake pedal is released, the unit will go into standby mode.

The display will also show trouble codes to alert you to any potential problems, such as a short circuit or an open circuit. A code will also appear if the brake controller surpasses its rated power limit.

Slide-Bar Manual Override

The manual slide lever overrides the preset power output and allows the operator to engage the trailer brakes without using the vehicle's brakes. In addition to being a necessary 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.

Quick, Simple Installation

Because inertia plays no role in the functioning of this controller, you do not have to mount the unit at any particular angle or position it in any particular direction. As a result, mounting options are limitless, so long as you can still easily access the manual override.

Installation of the Engage requires that you either purchase a custom wiring adapter designed to plug into the controller or that you hardwire the controller directly into your vehicle. To hardwire the Engage, 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.


  • If a custom brake-control wiring adapter is not available for your vehicle, one of the following will be required:
    • 20-Amp circuit breaker (9506 - sold separately) for 2-brake applications
    • 30-Amp circuit breaker (38630 - sold separately) for 4- to 6-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.

81760 Hayes Engage Electric Brake Controller - Time Based

Custom Wiring Adapter for Hayes Brake Controllers - Dual Plug
part number: HA81787-HBC

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 built-in port 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 built-in port 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.

This adapter plugs into the 4-pin connector on your vehicle's built-in brake control wiring harness. The harness is located underneath the dash, to the left of the steering column, taped to another harness near the emergency brake pedal.

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.

81787HBC Hayes Dual-Mated Brake Control Wiring Harness - Honda

Replaces 81787-HBC

Customer Reviews

Hayes Engage Trailer Brake Controller - 1 to 3 Axles - Time Delayed - HA81760

Custom Wiring Adapter for Hayes Brake Controllers - Dual Plug - HA81787-HBC

Average Customer Rating:  4.8 out of 5 stars   (32 Customer Reviews)

Brake controller engages your trailer brakes with a preset intensity when you apply the brakes in your vehicle. Power output and braking aggressiveness can be easily adjusted with built-in buttons. Includes digital display and manual override. 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 built-in port beneath your vehicle's dash.

- HA81760
by: Tevis Laspa06/21/2017

This was a replacement purchase. The original failed at 8 years old. The original started flashing the brake lights every 5 seconds while turned off and parked. Every thing fit back in the original spot. I have not tried the function with a trailer on. 397238

- HA81760
by: Robert09/21/2020

It work just great on my truck. 884622

- HA81760
by: 08/27/2020

It’s easy to adjust to get the brake controls. I have a 26 foot filth wheel camper and it makes it easy to stop in the event of emergency. 869818

- HA81760
by: Josh08/06/2020

Haven't hooked up yet, but came as des cribed. 857314

- HA81760
by: Andrew07/24/2020

Very simple install Happy with the ord er 850132

- HA81760
by: Troy J07/09/2020

Easy to install as I also ordered the wire adapter kit for my truck. Installation was quick and the unit works as I expected. Good investment for safety. Between the phone help with the ordering of the wire adapter kit and You Tube, it took me longer to watch the videos than it actually took to install it. 830353

- HA81760
by: Michael08/26/2019

Easy operation and simple to understand! Just the way I like it! 694347

- HA81760
by: Daniel08/08/2019

Installed easily, haven’t towed with brakes yet. 682391

- HA81760
by: Joseph07/16/2019

I purchased this item, didn’t read enough to know I needed an adaptor to fit my Chevy Silverado. Cut the wires and spliced them into my Chevy pigtail provided. Thought the item was not working. Called in and was told someone would call me back the next day with instructions. As told, a representative call me and advised me that Chevy has a different color code. After a quick change everything was functioning as hoped thank you e trailer 671183

- HA81760
by: James06/15/2019

I have not had a chance to use the brake controller yet. I did get it installed today. The installation was easy. The only thing that I might say is that the set up information was not very clear. It seems like there should be a notation somewhere in the set up about how long the lights are going to flash when there is an OC readout on the unit or how to stop the flashing. Maybe I missed something in the instructions. 658644

- HA81760
by: Timothy N.06/12/2019

Nissan Titan pulling a fully loaded 14x7 Cargo Mate Blazer enclosed trailer. The unit was pretty easy to install. etrailer included the proper wiring harness for my Titan. It is not difficult to find the proper brake setting for the load size and not hard to tweak on the fly. This unit worked like a charm while hauling this large load about 1000 miles. So far it has been worth every penny and I got it at a great price! 657023

I have not pulled my trailer since I helped some friends move back in February, but the harness was still working well at the time.
Timothy N - 07/15/2020


- HA81760
by: James06/08/2019

worked as advertised,just used once,if continue to work as did first time, very satisfied good buy for money 655368

- HA81760
by: Stephen06/08/2019

Product was what I ordered and installed easily and worked properly. Received order when promised 654998

- HA81760
by: Kenn07/13/2018

works very well with my 28 ft trailer....easy to install...fit nice in the cuby hole ...with a little mod.... on the lower left side of my dash......looks factory 541157

- HA81760
by: John05/09/2018

Works perfectly 505898

- HA81787-HBC
by: PaulG03/12/2018

Found the correct part quickly , fast delivery and worked just as it should! 484080

it worked fine until I sold the vehicle it was designed for! Now I am going to cannabilize it and hook up the controller to a different vehicle. I hope
PaulG - 03/15/2019


Sound like a plan. If you need to reference I have included a link to our help article that indicates how to install a brake controller from scratch. You would want to reference the diagram at the bottom of the page that shows the brake controller output wiring configuration.

-- Rachael H - 3/15/2019

- HA81787-HBC
by: Lydia12/12/2017

Everything worked well. Thanks. 459538

- HA81760
by: Vincent11/03/2017

Etrailer is never a disappointment. easy to order and always fast delivery. 449999

- HA81760
by: Steve P.09/10/2017

This controller was so easy, mounting it under the dash, put in the 40 amp fuse. And the controller was ready to go. Install time was less than a hour. That included going to the parts place and getting a fuse. I am very happy 430882

- HA81760
by: Susan04/20/2017

Shipment was prompt and I received exactly what I ordered. Super easy to install in my 2005 Dodge Ram 2500 and im a girl. :) 370243

- HA81760
by: Reggie04/15/2017

Easy as pie to install. Took about 15 min. to install. 367947

- HA81760
by: Phillip03/07/2017

Product came in on time. Staff was really helpful. And the plug in design took only about 15 min to install 5 stars for this company 353460

- HA81760
by: Chad G03/06/2017

Directions were perfect. Never wired a truck for trailer control. Got it right the first time. 349119

- HA81760
by: DAVE12/22/2016

Excellent brake controller, simple and easy to operate. 327408

- HA81760
by: Jose s07/19/2016

Easy to instal, the display is nice and bright, works great towing my 20 foot trailer. 273822

Show More Reviews

Ask the Experts about this Trailer Brake Controller

  • How to Install a Hayes Brake Controller on a 2000 Ford F-250
  • In order to install a Hayes brake controller like the Hayes Engage Trailer Brake Controller part # HA81760 on your 2000 Ford F-250 you will want to use the Custom Wiring Adapter part # HA81783-HBC which is a direct plug and play fit. I have attached a video which shows where the factory port is located for you. I took a look at you order and can confirm that the Ford Replacement OEM Tow Package Wiring Harness part # 118243 is correct for you.
    view full answer...

  • How to Connect a Hayes Engage Trailer Brake Controller # HA81760 in a 2008 Toyota Tundra
  • To install the Hayes Engage Trailer Brake Controller # HA81760 on your 2008 Toyota Tundra with a factory 7-way you wouldn't need to do any hardwiring. All you would need to do is plug in the # HA81785-HBC harness to your factory brake controller install port. The harness is located underneath the dash, to the left of the steering column, taped to another harness near the emergency brake pedal. The green wires that you have found on the brake controller port would not be needed to
    view full answer...

  • Installing Brake Controller on 2004 Ford Explorer With or Without Factory Tow Package
  • The Hayes Engage Trailer Brake Controller - 1 to 3 Axles - Time Delayed # HA81760 will plug right into your dash if you have the factory 7-way when you use wiring harness # HA81783-HBC. The connection point on your Explorer is behind the glove box on the passenger side. If you have the factory 4-way then you can use the wiring harness # HA81789-HBC which is a pigtail and then use kit # ETBC7 to complete your wiring. If you don't mind cutting the harness, you can avoid the pigtail
    view full answer...

  • Troubleshooting CP Code on Hayes Engage Trailer Brake Controller
  • I reached out to my tech contact at Hayes to assist. The CP code on your Hayes Engage # HA81760 is not outlined in your owners manual because it is a calibration setting that is only common to see at the factory. He recommends disconnecting the controller completely and letting it sit for about 10 minutes so it completely discharges and then reconnecting it to see if it will re-calibrate and work properly. If that does not solve the issue, he recommends having it replaced. If you
    view full answer...

  • Troubleshooting Brake Controller that Activates Truck Brake Lights Randomly
  • The problem is either the wiring of your brake controller or the brake controller itself has internal problems. What it sounds like is happening is that the stoplight switch of your brake controller (usually red) is backfeeding onto the brake light circuit of your 1997 Dodge Ram which is activating the brake lights of your truck. This would indicate that the controller has shorted out and would need to be replaced. I attached an FAQ on brake controller installs for you to check out as
    view full answer...

  • Brake Controller Recommendation for 2003 Winnebago Adventurer on Ford F-53 Chassis
  • Brake controllers are not vehicle-specific, so you can install whichever one has the features you want in the price range you prefer. Among the best options I can suggest is the Tekonsha Prodigy P3, part # 90195. This unit consistently sells very well because it is easy to set-up, straightforward in operation and has been proven to be exceptionally reliable. Have a look at our customers' ratings to see what purchasers say about it. The base vehicle that the Winnebago Adventurer is built
    view full answer...

  • Trailer Brake Controller Installation in 1996 Chevrolet Tahoe
  • You can install a brake controller like the Hayes Engage # HA81760 in your 1996 Chevrolet Tahoe using their wiring adapter # HA81789-HBC. You will also need our trailer brake controller installation kit # ETBC7 to complete your hardwired installation. So long as the Tahoe already has a 4-pole flat type trailer connector only the above items are needed, but if you do not have a 4-pole already you can use part # 118319. I have linked an installation video and article to help you with
    view full answer...

  • Troubleshooting OC Error Code on Hayes Engage Trailer Brake Controller HA81760
  • With the Hayes Engage Trailer Brake Controller # HA81760 the code OC indicates that the controller does not sense an electrical connection to the trailer brakes, or that the trailer has electric-over-hydraulic brakes which do not work with this unit. Since you also have an issue with your tail lights staying on the problem is almost surely corrosion inside the trailer connectors. Corrosion can build up inside a vehicle's socket and inside a trailer's plug and sometimes it is hard
    view full answer...

  • What Does a CL or cl Code Mean on a Brake Controller
  • I did some research and found that on some brake controllers, the "cl" code stands for Current Limit. This indicates that the brake controller has sensed a power requirement greater than its recommended output. This could result from an intermittent short to ground, a faulty brake magnet, or too many brakes connected to the controller. Some brake controllers like the Hayes Engage, # HA81760, are designed for 2 - 6 brakes (up to 3 axles). But others like the Hayes Synchronizer, # HA81725
    view full answer...

  • Troubleshooting Hayes Engage Brake Controller Showing BF Error Code
  • According to the operating instructions (I'll email you a copy) the bF error code indicates that there's a short somewhere in the brake output circuit, which is the blue wire that exits the rear of the controller and delivers the voltage to the trailer brakes through the trailer connector. Several things might be causing this. The first thing you will want to do is sever the blue wire from a few inches behind the brake controller. Leave enough wire so you can reconnect it later. Then
    view full answer...

  • Troubleshooting Hayes Engage Trailer Brake Controller Displaying Code CL
  • My technical contact at Hayes said their Engage Brake Controller # HA81760, the item you referenced in your question, could display the error code CL (current limit) if the trailer's brakes are trying to draw more current than the controller is intended to deliver. This controller is designed to power up to 6 brakes (2 each on three axles). If you are not exceeding the number of brakes that can be connected then chances are that there is a short in the brake circuit that is allowing
    view full answer...

  • Will the Hayes Engage Work in a 2013 Jeep Wrangler
  • Yes, you can use the Hayes Engage Trailer Brake Controller # HA81760 and adapter # HA81789-HBC in your 2013 Jeep Wrangler and it will be sufficient to tow your cargo trailer. Some models will require a wiring kit to run wire to the battery, so if you're not getting power when the controller is plugged in, you'll need to use part # 5506 which includes 20, 30, and 40 amp breakers. This is mostly just something we've found in vehicles that did not come with the factory towing package. The
    view full answer...

  • How Does Hayes Brake Controller Wire to a 2007 GMC Yukon XL
  • Your 2007 GMC Yukon XL has 4 wires under the dash that are to be used for wiring up a brake controller. The harness you have would be for newer GM SUVs and trucks. Your Hayes controller would need to wire to the wires under the dash using the attached link as a guide. I also attached a chart that shows how each of the wires on your vehicle would wire to the controller.
    view full answer...

  • How Does a Hayes Brake Controller Wire to a 2011 Chevy Silverado
  • On the 2011 Chevrolet Silverado Z71, the wiring for the brake controller is already ran and bundled underneath the dashboard on the driver side. This wiring may be taped together and tucked up and out of the way. There is not a plug-in wiring harness or brake controller port to plug into. In addition to connecting the brake control wires, there are 2 wires underneath the hood that will need to be connected (see FAQ and video). To install the Hayes Engage part # HA81760 you are going
    view full answer...

  • Installing A Brake Controller In A 2019 Ford Ranger
  • Your answer depends on what connector you have. If the Ranger has a factory-installed 7-way it should have a standard brake controller connection port above and to the left of your left knee when seated; this will be near the kick panel. If the truck instead has a factory 4-pole harness, under the dash there will be three blunt-cut wires, blue, yellow with red tracer and white with purple tracer each for the controller output, the 12V power input and the brake light switch wire. These
    view full answer...

  • Brake Controller Install Harness Recommendation for a Winnebago Adventurer 1998 35 foot
  • The correct brake controller install harness for the Hayes Engage Trailer Brake Controller # HA81760 that you referenced that would connect it to your 1998 Winnebago on a Ford F53 Chassis would be the Custom Wiring Adapter for Hayes Brake Controllers # HA81783-HBC. The correct port will be under your dash. There might be two similar looking connectors so if you find one and it doesn't work keep looking for the other one.
    view full answer...

  • Is the Brake Controller in My Truck Causing my Rear Brakes to Not Function Properly
  • The brake controller you have installed in your 2001 GMC Sierra 1500 would not affect the performance of the rear brakes of your truck. The functioning of the controller is far removed from how your brakes function. Removing the brake controller will not change or affect the problem you are experiencing. I would recommend you take your truck back to the shop that you had your brakes done at and have them look at it again. Or, if you don't trust them I would recommend you find a more
    view full answer...

Info for these parts were:

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

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