Hayes Genesis Trailer Brake Controller - 1 to 4 Axles - Proportional
Custom Wiring Adapter for Hayes Brake Controllers - Dual Plug

Part Numbers: HA81790,HA81781-HBC

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Hayes Up to 4 Axles Trailer Brake Controller - HA81790
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Hayes Genesis Trailer Brake Controller - 1 to 4 Axles - Proportional
part number: HA81790

Brake controller engages your trailer's brakes in proportion to deceleration. Mounts within a 125-degree vertical range. Easily adjust power output and braking aggressiveness. Solid-state design with digital display and manual override.


  • 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 level
    • 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
  • 5 Boost settings let you adjust initial braking power and aggressiveness
  • Easy-to-read digital display communicates brake power output, boost 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
    • 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 4 axles (8 brakes)
    • Designed for use with electric and electric-over-hydraulic brakes
  • Mounting position: between -35 degrees and 90 degrees in the vertical plane
  • Dimensions: 5-1/8" long x 3-1/4" wide x 1-1/4" tall
  • 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 Genesis 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 accordingly. The result is uniform braking across your towing setup. No push-pull action - just smooth, proportional braking every time.

Built-In Controls on the Genesis

Genesis Diagram

The diagram above shows the controls and components of the Hayes Genesis 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 Genesis controller to adjust the power 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 Boost for Heavy-Duty Towing

The Hayes Genesis 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 minus button until the display flashes, then release. Cycle through the available settings (5, 10, 15, 20, or 25) using the minus button and press the plus button to select one. 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 Setting
Much less than the tow vehicle5
Less than the tow vehicle10
Roughly equal to the tow vehicle10 or 15
Slightly greater than the tow vehicle15 or 20
Much greater than the tow vehicle20 or 25

Digital Display

The Genesis brake controller features an easy-to-read LED window that displays the 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 available. You can change this display to show 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 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

Genesis 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 Genesis 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.

Installation of the Genesis 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 Genesis, 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.


  • 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.

81790 Hayes Genesis Electric Brake Controller - Proportional

Custom Wiring Adapter for Hayes Brake Controllers - Dual Plug
part number: HA81781-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.


  • 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 BoxBrake-Control Adapter Port

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 second slot from the left, on 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.

81781HBC Hayes Dual-Mated Brake Control Wiring Harness - Chevrolet, GMC, Cadillac

Replaces 81781-HBC

Customer Reviews

Hayes Genesis Trailer Brake Controller - 1 to 4 Axles - Proportional - HA81790

Custom Wiring Adapter for Hayes Brake Controllers - Dual Plug - HA81781-HBC

Average Customer Rating:  4.8 out of 5 stars   (26 Customer Reviews)

Brake controller engages your trailer's brakes in proportion to deceleration. Mounts within a 125-degree vertical range. Easily adjust power output and braking aggressiveness. Solid-state design with 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 junction box beneath your vehicle's dash.

- HA81781-HBC
by: William06/29/2019
2001 Chevrolet Silverado

I was needing to install a brake controller in a newly-acquired 2001 GM pickup. The truck already had an available plug-in port, and I was looking for a connection cable between it and the controller. Due to their strong reputation for good business, I checked with eTrailer first. They not only had exactly what I needed, but the price was about the lowest around. I ordered the cable, and the shipping was fast. As expected, the cable fit perfectly, and was the precise length necessary. I have used this company before this order, and rest assured, I will do it again. 664464

- HA81790
by: Dave G.06/01/2018

I have concluded that there is no reason to shop anywhere except etrailer. They put so much into everything they offer, I don't have to get a forced education on their products. They do the homework. If etrailer says its good, order it, install it, its that easy. Every thing works perfectly! Thank you etrailer. 515012

- HA81790
by: Chris04/20/2019

Given the contradictory information about the availability of the grey connector under the steering wheel for a 2017 Ford Explorer Sport w factory tow package, I ordered the brake controller along with the wiring harness. In previous versions of the Ford Explorer, the plug is there. I took off the plastic cover and the metal plate that sits underneath the steering wheel. The plastic cover has two screws that hold the bottom of it and several push bracket - which was the hardest part to take off without breaking any of the plastic tabs. Once those two things are off tucked underneath the steering wheel is the grey plug. I plugged the wiring harness in, reinstalled the metal plate and the plastic cover. I used one of the holding screws for the plastic cover to attach the bracket for the brake controller (see pic) so that I didn't have to screw into the plastic cover. I was worried I would hit the brake controller with my foot or would be unable to use the hood release, but it sits just fine. Took less than 30 minutes to install. Unlike the last install of a brake controller which took me 7 hours to install all the wiring on my old Volvo XC90. Since I just installed this last night, I have not used it with a trailer. 633621

- HA81790
by: Ken K09/08/2020

Easy install on 2008 Ram 1500, easy to use. Perfect for 2-axle car trailer! 875684

- HA81790
by: John08/25/2020

Thus Hayes Genesis brake controller installed quite easily with an 2" aluminum plate I fabricated to enhance the mounting on my 2017 Ram. The recommended Hayes wire connection matched my existing Ram control harness. Mount, plug & play. The instructions for change to modes, settings were clear, easy to follow. Seems like an overall great controller, great value, made in USA! 868350

- HA81781-HBC
by: Tim08/24/2020
2002 Chevrolet Suburban

Very fast shipping, will buy from this store again, happy customer. 867944

- HA81790
by: C5720207/31/2020

Does the job it was made for. 857701

- HA81790
by: Jon07/16/2020

Awesome easy install exactly what I needed and in less time then I dreamed ordered and was at my door step less than 24 hours amazing 20 out of 10 starts one very happy customer thanks again !!! 844667

- HA81790
by: Keith B06/18/2020

I bought a travel trailer to tow with my 2015 Tacoma which has a factory towing package. It was a quick and easy install after I located the wire harness under the dash that it plugs in to. The controller works great. 817712

- HA81790
by: John F05/28/2020

Easy installation. No problems in the year I have had it. Works great. Trailer brakes activate smoothly even at low speed 806912

- HA81781-HBC
by: Alton05/25/2020

super fast shipping. definitely will use etrailer in my future needs 803211

- HA81790
by: Alton05/25/2020

super fast shipping. definitely will use etrailer in my future needs 805041

- HA81781-HBC
by: Billy11/05/2019
2001 Chevrolet Silverado

work well installed easy 722913

- HA81790
by: Dave10/21/2018

The controller fired right up and the supplied connector for my wife's 2009 F150 worked fine too. My second order from etrailer. Everything has been great with the exception discussed below - 2009 F150 owners take note - The video showing how to access the 2009 F150 tow package wiring harness plug is for trucks with bench seats. For bucket seats (aka, captain chairs) the plug is still in the location shown in the video, but bucket seat trucks have different dash trim than bench seat trucks. I was not able to fully remove the dash trim that is removed in the video, but was able to pull it away far enough to access the plug. I started removal from the top vice the bottom as shown in the video. That piece of trim has a lip that goes under the instrument cluster trim, but it can be coaxed out from under the cluster trim. Also, it helps to remove the kick plate trim piece near the floorboard to route the wires if mounting the controller on the trim below the steering wheel. The trim below the steering wheel can be removed to drill holes if that's where you're mounting the controller. All the trim pieces described above can be pulled loose by hand with the exception of the trim below the steering wheel which has 3 screws at the bottom. 576367

- HA81790
by: Brian10/05/2018

This model controller has performed well for my application. 572008

- HA81790
by: Anthony08/20/2018

item exactly as described. arrived quickly. Should be a breeze to install. 555919

- HA81781-HBC
by: Kenneth08/03/2018
2002 Chevrolet Suburban

Well made product that installed easily and great service! 549234

- HA81790
by: Terry06/01/2018

I ordered an after market brake controller that was delivered on the exact date they told me it would arrive. It’s the only controller that will work the electric/hydrolic brake system on my trailer. I have been very pleased with the Hayes genesis controler. 515753

- HA81781-HBC
by: Jesus12/12/2017

Very good 459449

- HA81790
by: Noel11/08/2017

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. 450194

- HA81790
by: Dennis M09/13/2017

Very easy to install on my 2013 tundra. Just remove inside panel by emergency brake pedal. Plug in , mount were desired, put side cover back on and hook up trailer. Adjust controler and go. 431966

- HA81781-HBC
by: Greg12/05/2016

Easy hook up , works great . 322354

- HA81790
by: Bill Clark08/12/2016

Very easy to use. Excellent product ov erall. 283251

- HA81781-HBC
by: Mike06/21/2016

Every thing works great 263265

- HA81790
by: craig a04/22/2016

Good product easy install. Brake proportion could be more sensitive when braking.... 246440

Show More Reviews

Ask the Experts about this Trailer Brake Controller

  • Will Hayes Genesis Brake Controller Work on a 2005 Toyota Tundra Limited
  • The Hayes Genesis # HA81790 with the adapter # HA81785-HBC is exactly what you need if your 2005 Toyota Tundra has the factory 7-Way. If your Tundra doesn't have a factory 7-Way then you'll need to use the pigtail # HA81789-HBC instead of the adapter, plus you'll need to install a 4-Way # 119179KIT and the Universal Installation Kit # ETBC7. As far as the air bag suspension goes, the Firestone # F4130 are for new Ram pickups so for your Tundra you're going to need the Firestone Ride-Rite
    view full answer...

  • Recommended Custom Wiring Adapter for Hayes Electric Trailer Brake Controller on 2011 Ford F-150
  • To install the Hayes Genesis Trailer Brake Controller # HA81790 on your 2011 Ford F-150 with tow package, you will use the Custom Wiring Adapter for Hayes Brake Controllers # HA81794-HBC. This harness will install to the factory wiring harness located behind the dash to the right of the steering wheel. I've attached a photo to assist.
    view full answer...

  • Advantage of Having Brake Controller That's Compatible with Electric Over Hydraulic Brakes
  • Electric over hydraulic brakes are a type of braking system on a trailer that utilizes a specific EoH actuator. It is essentially a mix between standard electric brakes and a hydraulic system. A brake controller like the Hayes Genesis # HA81790 that you referenced that can work with both electric and electric-over-hydraulic brakes simply provides greater versatility, since it's compatible with both types of setups. A brake controller that's only compatible with electric brakes will
    view full answer...

  • Troubleshooting OC Code On Hayes Brake Controller With No Trailer Connected
  • The Hayes Genesis Trailer Brake Controller - 1 to 4 Axles - Proportional # HA81790 you asked this from has a code of OC which means Open Circuit. This could mean a problem with the controller internally or it may mean that you have a slight draw on your 7-way due to corrosion. I recommend cleaning your 7-way pins with some sand paper or steel wool and if that doesn't solve your issue then testing your controller. I have attached a video of how to test your brake controller and have also
    view full answer...

  • Troubleshooting Hayes Genesis Brake Controller That Applies Minimum Braking During Sudden Stops
  • It sounds like your Hayes Genesis Brake Controller # HA81790 is not sensing the deceleration of your truck and trailer so it is not applying more than the minimum braking power when you apply the brakes. During sudden stops you should see the controller the maximum braking power you designate. This typically means that your brake controller is not mounted correctly. Because this controller operates with an internal inertia sensor, it must be mounted between -35 degrees and 90 degrees
    view full answer...

  • Troubleshooting Hayes Genesis Brake Controller HA81790
  • If there is a problem in your Hayes Genesis trailer brake controller # HA81790 that is causing the issue with the truck and trailer brake lights it will probably still occur on the truck alone if the trailer is unplugged. I suggest disconnecting the trailer plug from the 7-way socket and then checking to see if the problem persists. If you can borrow another trailer for testing that can help determine if the problem is on the truck or trailer side. If the truck brake lights behave
    view full answer...

  • Error Code Explanations for the Hayes Genesis Brake Controller part # HA81790
  • I attached a picture that I took from the installation instructions for the Hayes Genesis Brake Controller part # HA81790 that shows what the various codes mean and the possible causes for them.
    view full answer...

  • Flashing OC Code on Hayes Genesis Trailer Brake Controller When Vehicle is Off
  • A brake controller like your Hayes Genesis # HA81790 displays the "OC" message when there is an open circuit, which simply means that the trailer is not connected or the controller does not recognize a connection to the trailer. Since it is coming on when your vehicle is off, I recommend checking the vehicle and trailer connectors for any dirt or corrosion that could be causing this message to appear. Also, simply sliding the manual override on the brake controller all the way, then
    view full answer...

  • Hayes Genesis Brake Controller Stays In Standby Mode When Truck is Turned Off
  • Brake controllers such as the Hayes Genesis # HA81790 will go into a power saving mode after about 15 minutes of inactivity (sensing no movement). It may have an indicator light on showing that the controller is receiving power but this light draws only a few milliamps of power and it would take several months of it all just sitting there, not driving the truck at all, for it to drain the battery. There are some situations in which the brake controller can stay on. A dirty or corroded
    view full answer...

  • Does Computer have to be Flashed to Install a Brake Controller in a 2016 Ford F-150
  • You will not have to flash the computer on your 2016 Ford F-150 to install the Hayes Genesis brake controller # HA81790. I do recommend using the vehicle specific wiring harness # HA81794-HBC instead of a universal one that you would have to splice into the Ford harness. If you use the vehicle specific harness you can just plug the controller straight into the truck without having an intermediate harness between the 2.
    view full answer...

  • Troubleshooting OC Code on a Hayes Genesis Brake Controller
  • You wired up your Hayes Genesis Trailer Brake Controller # HA81790 properly to your 2006 Toyota Tundra. The problem is most likely at the 7-way connector at the rear of your vehicle (if there is one). OC would mean open circuit, which means that the trailer is not connected. The brake controller does not recognize a connection to the trailer. On some brake controllers it will also show OC if you are using a brake controller with an electric over hydraulic braking system on your trailer
    view full answer...

  • Hayes Genesis Trailer Brake Controller Flashing OC on Display Screen in 2002 Ford Explorer
  • I looked into the operating manual for the Hayes Genesis Trailer Brake Controller # HA81790 and it looks like when "OC" is flashing on the display, it indicates that either there is no trailer connection detected or the trailer has electric over hydraulic brakes, with which the Genesis is not compatible. If your trailer does not have electric over hydraulic brakes, check to make sure all the connections running back to your trailer are secure and correct. The other possibility is that
    view full answer...

  • Troubleshooting Blinking OC on Hayes Genesis Brake Controller on 2001 F-350 7.3L
  • Your Hayes Genesis Trailer Brake Controller # HA81790, has OC flashing which means Open Circuit. This means it is not recognizing a trailer connected and yet is recognizing a draw in power from the controller. This most likely means that the 7-way has some corrosion on the pins that needs cleaning or there is not a solid ground either at the 7-way or back at the brake controller itself. To clean your 7-way pins, I recommend using some light sand paper. To ensure you have a good
    view full answer...

  • Troubleshooting a Brake Controller that is Sending Max Voltage on Brake Output Circuit
  • Sounds like you need to test the brake controller so we can narrow down where the problem is. Testing the brake controller is fairly easy. Sever the blue brake output wire near the brake controller leaving enough room to reconnect it and then apply the manual slide. Using a circuit tester like the Quickee Tester, part # PTW2993, you should get output to the controller side of the wire you severed. If the manual slide activates the trailer brake output wire properly, try the brake pedal.
    view full answer...

  • Troubleshooting SF Flashing on Hayes Genesis Brake Controller
  • Unfortunately SF is not a reference they have in the owners manual for the Hayes Genesis # HA81790 but I reached out to my tech contact and he said SF stands for Slide Fault. It basically means there is an issue with the manual override slide. He said that if you unplug the unit and let it sit for about 15 minutes then reconnect it a reboot will occur. This may solve the issue, but if the slide fault reappears he said you will need to replace the controller.
    view full answer...

  • Will Hayes Brake Control Suffer RF interference and Overheating
  • I spoke with my contact at Hayes and he said the Hayes Genesis Trailer Brake Controller # HA81790 will not suffer any interference from cellphones, CB radios, etc. Based on my research most manufacturers of brake controllers insist on 12 to 18 inches of separation between CB radios and their brake controllers. I suggest mounting the brake controller and radio as far as possible away from each other to avoid interference when the brakes are applied. Distance is the key to keeping the electrical
    view full answer...

  • Troubleshooting Hayes Brake Controller that Wont Go to Full Voltage
  • The Hayes Genesis is prone to failure so let's test it to make sure it's working properly. Testing the brake controller is fairly easy. Sever the blue brake output wire near the brake controller leaving enough room to reconnect it and then apply the manual slide. Using a circuit tester like the Quickee Tester, part # PTW2993, you should get output to the controller side of the wire you severed. If the manual slide activates the trailer brake output wire properly, try the brake pedal.
    view full answer...

  • Troubleshooting Genesis Brake Controller that Reads 99 instead of 40 When Braking
  • Have you tried adjusting the gain of the controller down to 40? You probably already tried that but I figured I would at least mention it. What is the angle of the controller? It has to be installed in the range of angles that you see in the attached picture to work properly. Does the controller immediately read 99 when you touch the brakes? That would indicate a short on the brake output circuit most likely to a stoplight circuit. You would need to go over the wiring of the connectors
    view full answer...

  • Parts Needed for Brake Controller Installation for 2013 Toyota Highlander
  • I'd be glad to assist with that. We have some installation videos where our install crew will walk you right through the process. In addition to the # HA81790 Hayes Genesis brake controller, you'll also need the # HA81790 wiring pigtail, the # ETBC7 brake controller install kit and a # 118449 4-pole trailer wiring harness if your Highlander doesn't have one already. You'd begin by installing the 4-pole harness as shown in the linked video. Then, the install kit would be used to complete
    view full answer...

  • What Does Letter P On Hayes Genesis Brake Controller Indicate
  • For the Hayes Genesis part # HA81790 that you referenced the code P indicates that the controller is in the factory default mode. This is actually the recommended mode according to Hayes. I attached a picture I took from the install instructions for this controller that shows the different modes and how to change them.
    view full answer...

  • Troubleshooting OC Error Message on Hayes Blackbird Trailer Brake Controller
  • When the Hayes Blackbird Time-Delayed brake controller displays the error code OC this means that the controller senses that it has lost its electrical connection to the trailer's brake circuit. This code could be caused by many things: trapped water, dirt or corrosion inside the vehicle socket or trailer plug, or it could be due to a loose physical connection at the 7-way or at the blue wire at the back of the controller. The blue wire carries the output signal from the controller to
    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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