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

Part Numbers: HA81725,HA81783-HBC

Retail:$133.95
Our Price: $102.99
You Save: $30.96
Trailer Brake Controller

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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

Product Expert Kathleen M

Is this right for you? Product Expert Kathleen M says:

Yes, if you:

  • Are replacing an older brake controller and just want something simple
  • Are used to the old-school time-delay function
  • Prefer American-made products

No, if you:

  • Have a trailer with more than 2 axles
  • Worry about your brakes locking up and wearing out your tires prematurely
  • Like having detailed installation and troubleshooting instructions


Custom Wiring Adapter for Hayes Brake Controllers - Dual Plug
part number: HA81783-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.

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 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.


For most applications, the factory plug is located beneath the dash, near the center console.


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.



81783HBC Hayes Dual-Mated Brake Control Wiring Harness - Ford, Land Rover, Lincoln, Mercury

Replaces 81783-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 - HA81783-HBC

Average Customer Rating:  4.8 out of 5 stars   (113 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 built-in port beneath your vehicle's dash.

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: Rodney04/07/2024

Nice product and very easily installati on.



by: Rod 02/13/2024

works great



by: Chris04/20/2019
2017 Ford Explorer

I have a 2017 Ford Explorer Sport with the 5000lb tow package and there was contradictory information about the factory installed grey brake controller connector being there. I ordered the Hayes Brake Controller and the wiring harness and took a chance. I had taken a look before ordering but couldn’t see it. Once the parts came I went ahead took off the plastic panel under the steering wheel and the metal plate underneath it. Tucked high underneath steering wheel the grey plug is there. Plugged in the wiring harness replaced the metal plate, attached the Brake Controller bracket to one of the screws that holds the plastic panel. Done. It took less than 30 minutes. I haven’t hooked up a trailer yet, so I have no comment on the actual usage of the Brake Controller. But if anyone has a question about the grey plug for the factory installed brake control wire on a 2017 Ford Explorer Sport, it’s there.



by: Noel11/08/2017
Ford F-250 Super Duty

Once my son-in-law tracked down a burned out fuse and we eliminated the previous owner's wiring mess at the back bumper, the new brake controller and adaptive wiring turned out to be "plug and play" on my '96 F250. Worked just as easily as the wiring harness from etrailer that got me trailer brake lights from my '94 Jeep XJ several months ago. If I need something else for trailers, I'll check etrailer again.



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: Bill11/10/2017

I needed a brake controller for my vehicle that I am going to use for towing a new travel trailer I purchased. I found the etrailer site on the internet and was able to quickly locate an appropriate controller and vehicle specific connection cable. My order arrived in a timely manner. All of the necessary installation information was included and I was able to install it in my vehicle in just 20 minutes. Very pleased with the whole process.



by: Jonas08/04/2023

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



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: 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: 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: Nick 04/24/2023

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



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: 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: Rob08/27/2016

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



by: Joe 04/14/2021

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



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: Nick 12/20/2022

Perfect fit and length. Plug and play and you're good.



by: Dustin Hiett02/08/2015

First time user on eTrailer. Great website and easy to use. With my parts selected the site suggested the quick connect wire kit for my vehical. This made installation a breeze.


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


  • 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...

  • Brake Controller Install Harness for Hayes Synchronizer in a 2014 Chevy Silverado 1500
  • To install the Hayes Brake controller part # HA81725 in your 2014 Chevy Silverado 1500 only requires you to use the install harness part # HA81798-HBC which is a confirmed fit.
    view full answer...

  • Where is Brake Controller Install Wiring on 2012 Chevy Tahoe
  • I attached a picture that shows what the brake controller install wiring looks like on your 2012 Chevy Tahoe. I also attached a help article on the install process for you to check out as well.
    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...

  • Why Is My Hayes Brake Controller Only Getting 10v At the Brakes
  • The Hayes Syncronizer Trailer Brake Controller # HA81725 requires 12v to operate properly so since you're only getting 10v at the brakes that leads me to believe there is a wiring issue somewhere. You're going to need to go through your wiring, testing incrementally for voltage while looking for any damaged or exposed wires. If that's all good, I'd double check the wire is 10 gauge # 10-1-1 because smaller wire can cause also voltage drop. It's also a good idea to check your ground
    view full answer...

  • Brake Controller Wiring Harness For A 2009 Dodge Ram 2500
  • The correct wiring harness that will connect the Hayes Syncronizer Trailer Brake Controller part # HA81725 to factory wiring harness on your 2009 Dodge Ram 2500 is the Custom Wiring Adapter for Hayes Brake Controllers part # HA81782-HBC. This a complete plug and play option that will not require hardwiring unless you do not already have a factory trailer connector installed, in that case you will need to use the hardwire wiring harness that comes with the Hayes Syncronizer Trailer Brake
    view full answer...

  • How to Complete Hardwire Installation of Hayes Synchronizer Brake Controller
  • I'd be happy to assist with that. In addition to the # HA81725 Hayes Synchroinizer brake controller, you'll need a universal wiring harness, part # HA81789-HBC and our Brake Controller Installation Kit, part # ETBC7. The kit includes everything necessary to install a brake controller in your vehicle, with the exception of the controller itself and a 4-pole trailer wiring harness for the vehicle. If you click the provided link, you can see some FAQ articles about installing a brake
    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...

  • 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...

  • 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...

  • Hayes Brake Controller Install Harness Recommendation for 2014 Dodge Ram
  • To install a Hayes Syncronizer Brake Controller part # HA81725 in your 2014 Dodge Ram you would need the install harness part # HA81797-HBC which is a confirmed fit for your truck.
    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...

  • 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...

  • 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...

  • 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...

  • Will Hayes Syncronizer Brake Controller Work on a 2016 Ram 1500
  • In the newer Rams the stoplight switch of yhe truck uses a lower voltage signal than most vehicles so only some controllers can be used. The confusion you have experienced with your local dealer and trailer shop is most likely stemming from that. We have confirmation from Hayes that their Syncronizer part # HA81725 will work on your 2016 Ram 1500 and all you would need to install it is the harness part # HA81795-HBC.
    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...

  • 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...

  • Custom Wiring Harness for Hayes Brake Controller in 2017 GMC Sierra 1500
  • Your Hayes Syncronizer Trailer Brake Controller - 1 to 2 Axles - Time Delayed # HA81725 is confirmed to fit your 2017 GMC Sierra 1500 using the custom wiring harness # HA81798-HBC. 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
    view full answer...

  • Is An Adapter Needed To Install the Hayes Blackbird On A 1996 Ford F-250 With Tow Package
  • Yes, the Custom Wiring Adapter for Hayes Brake Controllers part # HA81783-HBC is required to install the Hayes Blackbird Trailer Brake Controller part HA81726 on your 1996 Ford F-250. The plug you will need to access for the above adapter will be located under your dash, near the emergency brake pedal.
    view full answer...

  • Wiring Hayes-Lemmerz Brake Controller to 2003 Ford F-250 w/ Factory 7-Way and Tow Package
  • For easy installation, you can use the Universal Brake Control Wiring Adapter Ford, part # HA81783-HBC. One end of part # HA81783-HBC will plug into the factory connector under the dash and the other end will plug into the connector coming out of the Hayes brake controller. I have linked a video installation of a brake controller on a 2005 Ford E-250.
    view full answer...

  • Brake Controller Install Harness Recommendation for Hayes Synchronizer in 2014 Ram 1500
  • The harness you need is the part # HA81797-HBC for installing your Hayes Synchronizer part # HA81725 in your 2014 Ram 1500.
    view full answer...

Info for these parts were:

Employee Lindsey S
Edited by:
Lindsey S
Employee Jameson C
Expert Research:
Jameson C
Employee Laura H
Updated by:
Laura H
Employee Wilson B
Updated by:
Wilson B
Employee Tammy D
Written by:
Tammy D

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