bing tracking image

Hayes Syncronizer Trailer Brake Controller - 1 to 2 Axles - Time Delayed
Custom Wiring Adapter for Hayes Brake Controllers - Dual Plug

Part Numbers: HA81725,HA81798-HBC

Retail:$123.16
Our Price: $81.90
You Save: 34%
Trailer Brake Controller

zoom in icon
slider vertical icon
zoom out icon
Comment field cannot be left empty.
Name field cannot be left empty.

Thank you! Your comment has been submitted successfully. You should be able to view your question/comment here within a few days.

Error submitting comment. Please try again momentarily.

Product Images

In Use/Installed

Customer Photos

Need help with installation?
Locate installers near me



Hayes Syncronizer Trailer Brake Controller - 1 to 2 Axles - Time Delayed
part number: HA81725

This time-delayed brake controller has a straightforward design that makes it easy to use. Includes an LED indicator and manual override. Activates brakes with a preset intensity.

Features:

  • Brake controller activates trailer brakes with preset intensity
  • Adjustable power output lets you select the amount of braking force
    • Thumbwheel located on front of module for easy access
  • Red LED indicator on front of unit illuminates when trailer's brakes are applied
    • Light glows brighter as power output increases
  • Slide-bar manual override is within easy reach for controlling trailer sway or stopping in emergencies
  • Built-in safeguards protect your vehicle and your trailer
    • Current limiter protects vehicle from shorts in the trailer wiring
    • Hazard flasher immunity prevents pulsing of the brakes when flashers are activated
  • Dependable solid-state construction
  • Quick and easy installation with no mounting restrictions
    • No need to mount level - install anywhere at any angle
    • Mounting bracket and hardware included
    • Plug-in, vehicle-specific brake control adapter (sold separately) available for select vehicles to reduce installation time
  • Made in the USA


Specs:

  • Application: trailers with up to 2 axles (4 brake assemblies)
    • Compatible with electric brakes only
  • Dimensions: 5-1/4" long x 3-1/8" wide x 1-1/4" tall
  • 3-Year limited warranty


Built-In Controls on the Syncronizer

Syncronizer Controls

Power Output Control

Braking output is the maximum amount of power that will be applied to your trailer's brakes. How much braking output you need is determined by the weight of your trailer; a heavier trailer will need more power to bring it to a stop. You want to set the braking output as high as you can without locking up the brakes. Once you've set up the brake controller the first time, you shouldn't need to adjust the settings until the trailer load changes, you switch trailers, or road conditions change. Use the thumbwheel on the left of the module to change your settings.


Red Indicator Light

The red LED indicator light illuminates when the trailer brakes are applied. This light glows brighter as the power output to the trailer brakes increases.


Slide-Bar Manual Override

The Hayes Syncronizer keeps the manual override within easy reach on the front of the module, great for stopping sway or controlling your trailer's momentum in emergencies. Push the slide-bar lever to activate the trailer's brakes and brake lights without you having to apply the brakes on your tow vehicle, perfect for limiting trailer movement while you're cruising.


Hayes Syncronizer review

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. Your mounting options are limitless, so long as you can still easily access the controller and manual override.


If your vehicle already has a plug-in brake controller wiring harness, just connect the unit to it. Otherwise, you will need to purchase a vehicle-specific wiring harness (sold separately) to plug into. If a harness is unavailable for your vehicle, hardwiring will be necessary.


Installation Accessories

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.


Note: If a custom brake control wiring adapter is not available for your vehicle, a 20-amp circuit breaker (sold separately) may be required for installation.


Time-Delayed Braking

What is time-delayed braking

The Hayes Syncronizer comes equipped with time-delayed braking. Every time you apply the brakes in your vehicle, a signal is sent - via the brake switch - to the Syncronizer. 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. The amount of braking power (output) can be adjusted to suit your preference, the road conditions, the type of trailer, and the weight of your load. To determine which levels are best for your application, test your towing setup and choose what feels right.



81725 Hayes Synchronizer Electric Brake Controller - Time Based

Item # HA81725



Custom Wiring Adapter for Hayes Brake Controllers - Dual Plug
part number: HA81798-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 junction box beneath your vehicle's dash.

Features:

  • 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 Box

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 first slot on the left, in 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.



81798HBC Hayes Dual-Mated Brake Control Wiring Harness - Chevrolet, GMC, Cadillac, Hummer

Replaces 81798-HBC

Item # HA81798-HBC




Customer Satisfaction Score:


Customer Reviews

Hayes Syncronizer Trailer Brake Controller - 1 to 2 Axles - Time Delayed - HA81725

Custom Wiring Adapter for Hayes Brake Controllers - Dual Plug - HA81798-HBC

Average Customer Rating:  4.7 out of 5 stars   (87 Customer Reviews)

This time-delayed brake controller has a straightforward design that makes it easy to use. Includes an LED indicator and manual override. Activates brakes with a preset intensity. 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.

by: Matthew04/28/2024

Controller was broken when I opened the package!!! The going dial was floating around in controller!!! I want my money back



by: Paul G04/16/2024
2017 GMC Sierra

Easy plug and play, and it works great with the Haynes Synchonizer on a '17 GMC Sierra 1500.

As always, eTrailer shipped it immediately.



by: Randall05/12/2024

No threaded inserts in unit and screws for attachmen, guess you get what you pay for



by: Rodney04/07/2024

Nice product and very easily installati on.



by: Ryan H04/08/2024

Super fast delivery and easy plug and play installation. Would highly recommend



by: Benjamin08/22/2023

Super easy to install and the additional information they provided for my specific vehicle made it possible for me to have every piece necessary for a seamless installation.



by: Don 02/06/2024

Great price, no delay as it came the same day as promised. Feel very comfortable dealing with etrailer !



by: Lawrence 09/07/2023

Splicing the wires was no problem. Instructions were good. The only recommendation that I will give is that you trash all screws with flat screw driver heads. I also opted for bolts, nuts & washers for attaching the bracket.



by: Ed09/13/2023

I think it will be a good brake controller, I have not had a time delayed on before.



by: Rod 02/13/2024

works great



by: Bob P.04/10/2016

Original supplied item was defective, however Hayes customer service immediately sent another unit and it works great. With the addition of a small removable slip in bracket for the console of my 2012 GMC 1500 Crew Cab and the wiring adapter, I can simply plug and play when I need the controller as opposed to a permanent installation that I have in my other pickup.



by: Dylan 04/10/2021

Works well. I like the delayed brake activation, it seems to be a smoother transition. The custom harness makes installing this controller easy and FAST. Love buying Made in the USA products and etrailer.com has a lot of them.



by: Jonas08/04/2023

Installation was simple and straightforward. Took less than 30 minutes from start to finish.



by: Larry 07/28/2023

Looks good!



by: Frank 11/16/2019

easy to install. Brakes tested good to trailer. I used self taping screws to mount brackets, rather than the bolts and nuts that it came with.It was to difficult to get my hands in position to use bolts and nuts (no big deal).



by: Dylan 09/26/2021

This is the 2nd one of these I’ve bought. I like the time delay application to the brakes. Always will try to buy products made in the USA. The price went up since I bought this same controller 1 1/2 years ago.



by: Donny11/09/2017

Worked like a charm. Standard shipping time was ridiculous, took waaaaay to long from Missouri to Arkansas.

Etrailer Expert

Laura E.

11/10/2017

Thanks for taking the time to submit your recent product review. We appreciate your business! With the value shipping option, UPS delivers the package to the post office and then the post office finalizes the delivery. It can take 7 to 10 business days for delivery.



by: Dave 2018 ram 1500 eco 04/07/2019

Installed in 10mins in 2018 ram 1500 ecodiesel, have not used with trailer yet. Seems good for price, mounting bracket could be made a little better. Good service from e trailer



by: Gary03/19/2015

Good controller at a good price. Works as expected. Fast shipping at standard rate. This controller was installed in an 08
Sprinter camper with the help of the on line video from etrailer.
Thanks,
Gary



by: Nick 04/24/2023

Fit perfectly. Followed instructions and it works as it should. Great product at a great price.



by: Joe 04/14/2021

Was easy to install and adjust. Works great applying breaks to my single axle dump trailer.



by: Rob08/27/2016

Installed in 10 minutes. Works excellent and combined with the wiring adapter was a simple plug and play.



by: Andrew Ammerman04/11/2017

The trailer seems to be holding up just fine. It was a good investment for my small business and I'm thinking about buying another from you.



by: Richard 07/03/2023

deliverd on time. and plugged right in thanks



by: Duncan06/10/2019

super fast delviery great product pluged right in


25
87
Show More Reviews

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


  • Which Brake Controller Wiring Adapter Harness for 2011 Lexigton RV on Ford E-450 Chassis
  • The brake controller connector is located behind a panel just to the left of the glove compartment, as shown in the provided photo. The wiring harness adapter used will depend on the brake controller you end up using. I see that you've looked at a Hayes Syncronizer # HA81725 brake controller. If you use a Hayes controller, you'd need the # HA81788-HBC adapter. For a Tekonsha or Draw-Tite, use # 3034-P or for a Curt controller, use # C51432. Rather than a time delayed controller like
    view full answer...

  • Recommended Trailer Hitch and Wiring Harness for 2011 Ford E350 Van Towing Small Canoe Trailer
  • We have several choices that would be a fit for you, I'd recommend the Curt Class III receiver hitch, part # 13055. The hitch has a respectable 600 lb tongue weight/ 6000 lb towing capacity, so it'd be the perfect choice. The hitch is pretty simple to install, with no drilling required. For a trailer wiring harness, use part # 118551. For a ball mount, # AMSC2 would work very well. The coupler on your trailer will list the necessary trailer ball. For a 1-7/8 inch diameter ball, use
    view full answer...

  • Plug and Play Wiring Adapter For Hayes Syncronizer Brake Controller On 2022 Chevy Silverado 1500 LTD
  • The Custom Wiring Adapter # HA36FR will allow you to connect your Hayes Syncronizer Trailer Brake Controller # HA81725 to your 2022 Chevrolet Silverado 1500 LTD.
    view full answer...

  • Wiring Harness to Connect Hayes Syncronizer Brake Controller # HA81725 to 2005 Dodge Ram 1500
  • The existing wiring harness you have used to connect your Hayes Syncronizer Trailer Brake Controller # HA81725 to your 2007 Dodge Dakota will also work to install this unit in your 2005 Dodge Ram 1500. The harness is part # HA81782-HBC and it plugs in between the hardwired connector at the back of the controller and the connection port under the dash on your Ram 1500. The Hayes Syncronizer brake controller # HA81725 is a time-delayed type as opposed to a proportional type brake controller.
    view full answer...

  • Wiring Harness for Installing HA81725 Hayes Synchronizer Brake Controller on 1998 Ford E350 Van
  • We offer the Ford-specific Hayes brake controller wiring harness as part # HA81783-HBC. One end of the harness plugs into the connector under the dash, the other plugs into the pigtail exiting the rear of the Hayes # HA81725 Synchronizer brake controller. The brake control connector on your E-series van is located either under the left side of the dash or next to the center console. It will be in the very corner where the floor board, firewall and the left kick panel come together. This
    view full answer...

  • Wiring Adapter For a Hayes Syncronizer Trailer Brake Controller to 2001 Ford F-150 With Factory Tow
  • To connect the Hayes Syncronizer Trailer Brake Controller # HA81725 on your 2001 Ford F-150 with the factory tow package you will need the Wiring Adapter # HA81783-HBC. This adapter will connect to the controller and has the Ford factory connector on the other end for a plug and play connection.
    view full answer...

  • Parts Needed to Install Brake Controller in a 2016 Ford Transit
  • To install a brake controller in your 2016 Ford Transit Connect tou will need to start with a 4-way (if you do not have one). For that you would want the # C56218. From there you would need to convert the 4-way to a 7-way so that you can install the brake controller. For that you will want the Brake Controller Install Kit and 7-Way Adapter part # ETBC7. I attached installation instructions and an install video for this product as well. For a brake controller I would recommend the
    view full answer...

  • Troubleshooting Cruise Control Not Working After Brake Controller Install
  • Sounds like you connected the red (stoplight switch circuit) wire to the wrong circuit on your truck. When the cruise control on a vehicle starts acting up that is a tell-tale sign that the wrong circuit is being used for the red wire. What you want to do is use a circuit tester like part # PTW2993 to test the wires near the brake pedal to find the circuit that only sees 12 volts when the brakes are applied and none when the brakes are released. Correcting this should take care of both
    view full answer...

  • Troubleshooting Hayes Syncronizer Trailer Brake Controller
  • That is not normal. The Hayes Syncronizer Trailer Brake Controller - 1 to 2 Axles - Time Delayed # HA81725 should not give off any smell and should not be activating the brakes enough to cause smell if installed and adjusted properly. I've attached a video of this installation for you to reference. When installed correctly, this unit should be adjusted for sensivity. This conroller has a red LED indicator on front of unit that illuminates when trailer's brakes are applied. This
    view full answer...

  • Brake Controller Compatibility with 2015 Audi Q7 TDI Prestige
  • The Hayes Syncronizer Trailer Brake Controller -Time Delayed # HA81725 can be used on your 2015 Audi Q7. You will need to hardwire your controller, but I recommend using the wiring adapter # HA81789-HBC to allow you the quick connection so you can use this controller on other vehicles if desired. You will also need to use additional wiring as you pointed out. You will need to ask your authorized dealer for #1J0-972-782 housing (qty. 1) and #000-979-228 wire/terminal assemblies (qty.
    view full answer...

  • Recommended Hayes Trailer Brake Controller Wiring Harness for 2003 GMC Sierra SLT with Tow Package
  • For your Hayes Syncronizer Trailer Brake Controller # HA81725 on your 2003 GMC pickup with tow package, you will want wiring adapter # HA81780-HBC. This will plug into your junction box beneath your vehicle's dash. That is all you will need as you stated.
    view full answer...

  • What Functions do the Wires on the Hayes Syncronizer Trailer Brake Controller # HA81725 Connect to
  • Of course! The Hayes Syncronizer Trailer Brake Controller # HA81725 has 4 wires on it that connect to the following functions: Blue - Brake Signal Output Black - 12V Power from Battery White - Ground Red - COLD Side of Stop Light Switch (only gets hot when brake pedal is pressed) If you let me know what vehicle that you are installing it on I can check to see if there is a plug-in adapter so that you don't have to cut the connector off of your tow vehicle shuld one exist.
    view full answer...

  • Uninstalling Hayes Syncronizer Brake Controller From 2014 Ford Explorer
  • To disconnect the Hayes brake controller you can simply unclip the wiring connection behind your trailer brake controller and tuck it out of the way. Then you can remove the brake controller from it's mount and either discard it or sell it. It will not in any way effect the braking on your vehicle. It only captures the brake light signal and then sends power to a trailer with brakes. Removing it will have no impact on your vehicle but only on your trailer towing ability.
    view full answer...

  • Wiring Adapter to Install Hayes Synchronizer # HA81725 Brake Controller in 2008 Toyota Tacoma
  • Hayes does indeed offer a brake controller wiring adapter that's compatible with the 2008 Toyota Tacoma that's equipped with the factory 7-way trailer connector, part # HA81785-HBC. I've provided you a photo of what the connector that will plug in under the dash looks like. It's a four pin connector, and you can clearly see the pin-out in the photo I've edited for you. Your factory connector under the dash will have 5 pins, but the aftermarket wiring adapters and brake controllers
    view full answer...

  • Recommended Pigtail for a Hayes Syncronizer Brake Controller on a 2012 Chevy Tahoe
  • Though the 2012 Chevy Tahoe will have all the wires run for a brake controller, there is no port present under the dash for one to plug directly into. That being said, we do have a plug that will attach to the one on your Hayes Syncronizer # HA81725. The # HA81789-HBC will have bare wires on the end so you can connect to the wires under the dash.
    view full answer...

  • How to Find the Brake Wire on a 2000 Chevrolet Express Van
  • In order to find the brake wire under your dash, you are going to need a circuit tester like part # PTW2993. Then you are going to need someone to engage the brake on your 2000 Chevrolet Express Van as you use your circuit tester to see which is the brake wire. When you find the right wire, a light will glow on the circuit tester. The wires you need to test are the bundle of wires coming out of the back of the brake pedal stop light switch. Use the circuit tester to find the hot wire
    view full answer...

  • Wiring Colors for Kelsey Hays Brake Controller 81739
  • Your old Kelsey Hays brake controller uses the standard wiring colors for brake controller install. The red goes to the stoplight circuit, the black goes to the 12 volt power supply, and blue goes to the trailer connector as it's brake output.
    view full answer...

  • Which Brake Controller Adapter for 2017 Nissan Pathfinder with Hayes Synchronizer
  • You can use a Hayes Synchronizer # HA81725 in your 2017 Nissan Pathfinder using the plug and play adapter Custom Wiring Adapter for Hayes Brake Controllers - Dual Plug # HA81786-HBC. This will be the plug that goes from the car to the controller.
    view full answer...

  • Why Does Hayes Syncronizer Brake Controller HA81725 Not Light Up When Pedal is Pressed
  • The display on the Hayes Syncronizer Trailer Brake Controller # HA81725 should illuminate both when you press the brake pedal and when you use the manual override lever. If it does not light up when you press the brake pedal then either there is a problem wit the red wire's connection to the brake light circuit or you have the power set so low that the display does not light up. The controller will apply full power with the manual lever but with the brake pedal it will illuminate only
    view full answer...

  • Will Hayes Sincronizer Trailer Brake Controller Fit on a Honda Goldwing Motorcycle
  • Yes, the Hayes Syncronizer Trailer Brake Controller # HA81725 is a good choice with your Honda Goldwing. A time delayed controller is a better choice on a motorcycle because of the limited space for installation. A proportional controller has more limitations as to how they can be mounted which will be an issue on a bike. Also, the leaning of a motorcycle while turning will tilt the controller and a proportional controller cannot function this way. To connect the controller to the
    view full answer...

  • Will Hayes Custom Wiring Harness for Electric Brake Controllers Fit a 2016 GMC Truck
  • Yes, the Hayes Custom Wiring Adapter # HA81798-HBC is the correct wiring harness to connect a Hayes electric brake controller into a 2016 GMC Sierra 1500, 2500, or 3500. I've linked our selection of Hayes brake controllers, as well.
    view full answer...

  • Recommended Plug-In Harness for Hayes Brake Controller on 2017 Chevy Silverado 1500
  • Based on my research, the simple Hayes plug-in harness # HA81798-HBC is the same and will work for both the 2014 Chevrolet Silverado 1500 and 2017 Silverado 1500. You will be able to use the same plug for your Hayes Endeavor Brake Controller on your new truck. Just like in your 2014 truck, one end of the harness will plug into the port beneath the dash of your vehicle and the other end will plug into the controller itself.
    view full answer...

  • Is There a Harness for Brake Controller on 2016 Jeep Renegade?
  • All brake controllers on your 2016 Jeep Renegade, including one such as the Hayes # HA81742B, will need to be hardwired in as there is no compatible harness. Due to the difficulty in locating the stoplight wire it is recommended to get your brake controller professionally installed. The brake controller I strongly recommend is the Prodigy P3 # 90195; it is the most popular model we carry due to its effectiveness and ease of use. It will activate your trailer's brakes immediately in
    view full answer...

Info for these parts were:

Employee Laura H
Written by:
Laura H
Employee Cole B
Installed by:
Cole B
Employee Wilson B
Updated by:
Wilson B

At etrailer.com we provide the best information available about the products we sell. We take the quality of our information seriously so that you can get the right part the first time. Let us know if anything is missing or if you have any questions.