Hayes Trailer Brake Controller
- HA81725
- Electric
- Time Delayed Controller
- Hayes
- Under-Dash Box
- Up to 2 Axles
- Automatic Leveling
- Dash Mount
- 360 Degrees
- Indicator Lights
Economically priced brake controller automatically engages your trailer's brakes with a preset intensity when you apply the brakes in your vehicle. Power output is easily adjustable. Includes LED indicator and manual override.
Features:
- 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 output when towing a lightweight or empty trailer
- Red LED indicator on front of unit illuminates when trailer's brakes are applied
- Light glows brighter as power output increases
- Built-in safeguards protect your vehicle and your 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
Specs:
- Application: trailers with up to 2 axles (4 brake assemblies)
- Designed for use with electric brakes only
- Dimensions: 5-1/4" long x 3-1/8" wide x 1-1/4" tall
- 3-Year limited warranty
Time-Delayed Braking
The Syncronizer 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 Syncronizer. The controller then sends power out to your trailer brakes to activate them with an intensity you have set. The amount of braking power can be adjusted to suit your preference. 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 Syncronizer sends power out in the same way, with the same user-set delay, no matter the braking situation. 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 Syncronizer
![Syncronizer Controls]()
The diagram above shows the controls and components of the Hayes Syncronizer 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 thumbwheel on the left front of the Syncronizer to adjust the output. To get more power to your brakes, rotate the dial upward. To decrease the power output, move it downward.
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 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 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.
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 Syncronizer 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 unit, 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 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-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.
81725 Hayes Synchronizer Electric Brake Controller - Time Based
Installation Details
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