Hayes Sway Master Electronic Sway Control System - 1 to 4 Axles

Hayes Sway Master Electronic Sway Control System - 1 to 4 Axles

Item # HA81775

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Weight Distribution

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HA81775 - Electric Brake Compatible Hayes Sway Control Only
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  • Sway Control Only
  • Hayes
  • Reduces Sway
  • Electric Brake Compatible
Sway control system helps correct sway in trailers that do not need a weight distribution hitch. To do this, the unit activates the trailer brakes based on the degree of sway and the trailer's speed. Gyroscope and GPS monitor sway and speed. Lowest Prices for the best weight distribution from Hayes. Hayes Sway Master Electronic Sway Control System - 1 to 4 Axles part number HA81775 can be ordered online at etrailer.com or call 800-298-8924 for expert service.


  • All Info
  • Reviews (6)
  • Q & A (23)
  • Videos (1)
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  • Why etrailer?

Hayes Weight Distribution - HA81775

Sway control system helps correct sway in trailers that do not need a weight distribution hitch. To do this, the unit activates the trailer brakes based on the degree of sway and the trailer's speed. Gyroscope and GPS monitor sway and speed.


Features:

  • Electronic sway control system limits side-to-side movement of trailer during towing
    • Unit corrects sway by activating trailer brakes and can be mounted almost anywhere on trailer's tongue
  • Solid-state gyroscope senses sway and activates all trailer brakes simultaneously
  • GPS monitors speed and determines the brake force needed to correct sway at that speed
  • Plug-and-play system requires no hardwiring and plugs in-line with your current setup
    • 7-Way connector from your trailer plugs into Sway Master unit
    • Harness from unit plugs into the 7-way socket on your vehicle
    • Plug holders keep the connectors securely plugged into the sockets
  • Parallel circuitry - won't interfere with normal braking or signals from brake controller
  • Molded construction is water resistant and durable to protect internal components
  • Self-calibrating design - no need to set up or continually adjust
  • Included screws attach unit to the A-frame of your trailer
    • Some drilling required
  • Made in the USA


Specs:

  • Application: trailers with up to 4 axles (8 brake assemblies)
    • Compatible with electric or electric-over-hydraulic brakes
  • Dimensions: 7" long x 3-1/2" wide x 4" tall
  • Harness length: 5'
  • 2-Year limited warranty


The Sway Master electronic sway control system helps to eliminate trailer sway for a better, safer towing experience. The Sway Master is ideal for use on light- and medium-duty trailers that don't require weight distribution. But it can also be used along with a weight distribution system for an even better towing experience. The Sway Master is different from most other sway control systems because it is not a mechanical system that either actively holds your trailer in line or pushes it back into line. Rather the Sway Master is an electronic system that senses movement and activates your trailer's brakes to halt that movement. It features solid-state gyroscope and a GPS, which actively monitor sway and speed respectively. When the gyroscope senses sway, the system applies the brakes to correct it.


How Sway Master Works

While the built-in GPS and gyroscope are always actively sensing, the Sway Master does not activate until the trailer reaches 45 mph. This helps to prevent unnecessary braking when making turns at slow speeds. Once that minimum speed is met and sway is detected, an algorithm based on the trailer speed and the degree of sway is used to determine the amount of braking force that is needed to counteract the sway. The Sway Master unit will then activate your trailer's brakes with that intensity.


Installation

Sway Master Installation

To install the Sway Master, you will be required to drill into your trailer's frame. Attach the Sway Master unit to the tongue using the included screws. In order for the GPS within the Sway Master to work properly, the top of the unit must be completely exposed to the sky. Other than ensuring that the top is not covered and that the unit is pointing in the correct direction for hookup, there are no mounting restrictions. Place the Sway Master anywhere along the rail so that you can clear other equipment or obstructions on the frame of your trailer.


Sway Master Connector

The unit plugs in-line with your current setup. Just plug your 7-way trailer connector into the 7-way socket on the unit, and then plug the integrated harness into the 7-way socket on your vehicle. You will know the Sway Master is connected properly when the indicator light flashes 3 times. The light should continue to be illuminated as long as the unit is receiving power from the tow vehicle. If the light shuts off, there may be a connectivity issue.



81775UPG Hayes SwayMaster Electric Sway Control System

Replaces 81775 and 81775-1






Video of Hayes Sway Master Electronic Sway Control System - 1 to 4 Axles


Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.




Video Transcript for Hayes Weight Distribution - Sway Control Only - HA81775 Review

Today we're going to be taking a look at the Hayes Sway Master Electronic Sway Control System. The Sway Master is useful for use on light and medium duty trailers that don't require weight distribution. But it can also be used along with the weight distribution system for an even better towing experience. This weight control system is going to limit side-to-side movement of the trailer while towing. What it does is correct sway by activating the trailer brakes and it can be mounted almost anywhere along the trailer's tongue. The unit's going to activate the trailer brakes based on the degree of sway and the trailer speed.

To do this it's going to use two main components. It's going to have a solid state driver scope that senses sway and activates all the trailer brakes at the same time and it's going to use GPS that monitors the speed and determines the brake force needed to correct sway at that speed. The unit will not activate until the trailer reaches 45mph, this helps prevent unnecessary braking while making turns at slower speeds. To get the unit set up, it's a very simple design that's going to use a plug-and-play system that doesn't require any hard wiring. The unit's going to plug directly inline with your current setup. So the 7-way connector is going to plug into the Sway Master unit on this side.

It's got the nice plug right there, fully installed, built in. It's got the gasket on the underside of the lid to keep out moisture and dirt and the elements from the connection points. And then on this side we're going to have a harness that measures about 5 feet long. It's got the 7-way plug that's going to plug into the tow vehicle. Now the unit's going to feature parallel circuitry, which means that the unit will not interfere with normal braking or the signals on the vehicle from the brake controller, so it's going to be protected in that regard. The unit's also going to come with a plug holder that can be mounted to the trailer to keep the plug safe and secure when it's not hooked up to the tow vehicle.

So you would have this mounted to the trailer, when the plug's not being used, you simply put it into the plug holder. What that does is it keeps the unit off the ground, it keeps your connector safe and it also keeps the unit accessible for when you're ready to hook everything back up. It's going to come with the hardware to get the box installed on the trailer frame, as well as the hardware to get the plug holder installed at the mounting location. Now, this is going to give us a measurement of about 5" long. The height, top to bottom, is 2.5" distance between the mount holes right here, center on center is going to be about 4" and it's going to stick up about 2 3/16" from the mounting surface. The molded construction of the unit is water resistant and it's durable so it's going to do a great job of protecting all the internal components.

The unit's also going to feature a self-calibrating design so there's no need to set up or continually adjust the unit. Very simple and easy to use. Now, again, it does dome with the included screws to attach the unit to your A-frame trailer. The Sway Master can be placed almost anywhere along the framing or tongue of the trailer, so that way you can clear other equipment with instructions on the frame of your trailer. So, it's a really nice, easy to use design, it's lightweight, very easy to maneuver and get installed and it's got a nice tight seal right here that threads together from the connection from the vehicle to the Sway Master and then from the Sway Master to the trailer. Now, one of the things I want to mention is that you will know that the Sway Master is connected properly. There's going to be an indicator light on the unit that's going to flash three times and that light should continue to be illuminated as long as the power is--or as long as the unit's receiving power from the towed vehicle. Now this is designed for trailers with up to 4 axles or 8 brake assemblies. It's compatible with electric or electric over hydraulic brakes. A few measurements I want to go over with you real quick, regarding the Sway Master. If we take a measurement of the overall length of the unit, so I'm measuring from the front of the plug to this point right here where that connector kind of begins, overall length, so going from about this point here to about this point here, we're looking at a measurement pretty close to 9". If we take a measurement of the width, I'm measuring from this point right here to this point here, so that's going to give a measurement of about 3 3/4" wide. Overall height, that's going to be about 4 7/8" tall. Now when it comes to the dimensions of just the bracket right here, that's this back piece, that's going to give us an overall length measurement, that should be about 7 1/2". The overhang, which on top has two mount holes, that's going to give us a depth of about 1 5/8". And then from the underside of the overhang to the bottom of the unit's going to measure about 4 3/8". Again, the harness length is going to be about 5". I'm going to give you the separation of our mount holes. We have two here on top. These are going to be separated on center by pretty close to 3 3/8". Then we have a mount hole here and a mount hole right here. Those are going to be separated on center going on a straight line measurement of about 5 1/8". The product is made in the USA. Now, a note that I need to mention for you real quick is that in order for the GPS in the Sway Master to work properly, the top of the unit must be completely exposed to the sky. Other than insuring that the top is not covered and that the unit is pointing in the correct direction for hookup, there's no other mounting restrictions. And so, it's a low profile design, 4 mount holes total, and it comes with all the hardware needed to get the unit installed. That's going to do it for today's look at the Hays Sway Master Electronic Sway Control System. .


Customer Reviews

Hayes Sway Master Electronic Sway Control System - 1 to 4 Axles - HA81775

Average Customer Rating:  4.8 out of 5 stars   (6 Customer Reviews)

Sway control system helps correct sway in trailers that do not need a weight distribution hitch. To do this, the unit activates the trailer brakes based on the degree of sway and the trailer's speed. Gyroscope and GPS monitor sway and speed.

- HA81775

by:


I have installed the product, but want be taking a tripuntil september. 274868



- HA81775

by:


Great experience...I had a issue that was resolved immediately...Will buy again... thanks 301204



- HA81775

by:


The Hayes Sway Control unit works very well. The first time I towed with it I took a turn a liitle too fast and the unit lightly tapped the trailer brakes to keep the trailer from swaying. I am very pleased with it and feel much safer when towing. 385481


Comments

It works great. One of the best RV related purchases I have made. We feel much safer towing with it.

Harry D - 05/29/2018

39056

- HA81775

by:


bought a hayes electronic sway control for a bohemuth of a trailer I got. 30 foot trailer with a toy hauler measuring 26 feet long, 13 feet tall, weighing right at 14,000 pounds loaded with jeep inside. I don't run sway bars or weight distribution, partly because the sway control / weight distribution hitch I bought broke and put my trailer on the ground, lucky no damage done and I was able to stop trailer and truck safely. So until this purchase winds and driving at highway speeds was a task for sure even with a suitable tow vehicle because this trailer is like a big sail in the wind. So I mounted the hayes electronic sway system and it was a breeze, maybe 15 minutes max. I drove 3 hours in high winds to my destination and this system really works. sure I could feel the trailer moving around but it wasn't moving my truck around and the trailer was correcting itself without me having to get out of the gas. I did 65 to 75 mph the entire way and never once felt like I wasn't in control. winds were 25 mph plus that day. drove back in much less windy condition and couldn't even tell the trailer was back there for the majority of the drive. Love this hayes controller and the order and shipping with etrailer was flawless. I rarely buy things on-line, but this one was a good one. Neal 254335



- HA81775

by:


After encountering a situation which was beyond the ability of our Equal-i-zer hitch to correct--that being ice and a crosswind gusting to 40 mph, I wanted something to help prevent another accident. This seems to be the solution for which I was looking. I had thought that if I had been able to reach the manual brake control and activate the trailer brakes, it might have been enough to prevent us from what became a worsening sway culminating in us doing a 180 jackknife on Interstate 80 and facing the way from which we came. At the time, I did not have the third hand I would have needed to do this, nor did it come to mind in the middle of the situation. Enter the Hayes Sway-Master Electronic Sway Control. From what Hayes says, it would have been what was needed when we had that accident. I think it might have prevented the swaying from increasing from minor to major to accident. It would have detected the situation and applied the trailer brakes even faster than I could have reacted. However, we did not have it at the time. It is now installed. I took it out in a situation where we had wind gusting to 30 mph. I did not have the Equal-i-zer's bars on as I had removed a number of items from the trailer and it was not properly adjusted for the new tongue weight. I figured it would be a better test anyway since the bars would have acted to counter sway. This way, any sway control would be the result of the Hayes Sway-Master. I now tow a Forest River R-Pod 179 with a 2010 Nissan Frontier LE Crew Cab. While I could feel the wind pushing the R-Pod, I did not feel like it was about to lose control. I really don't know if the Hayes Sway-Master had to activate the brakes. While there was wind, there was no ice. I don't know if the wind by itself was causing enough sway for the unit to try to correct it. This leads me to the one negative I want to mention. There is no visual or audio indicator that the unit has applied the brakes to eliminate sway. One just can't tell easily what is happening. The blue status light on the unit is not visible from the tow vehicle, and it indicates power, not activity. It would be good if Hayes would make some sort of indicator that could be mounted where it would be visible to the driver or would be audible. That would earn the product that 5th star. One other item was not addressed in the instructions. That the unit needs to be disconnected from the tow vehicle while not being used is evident. What is not so much so is that the trailer's plug also needs to be disconnected so that the unit will not be a parasitic drain on the trailer's battery I asked about this when I noticed the blue light remains lit when the tow vehicle is disconnected. The answer is that both plugs should be disconnected. The instructions should address this. This was not enough to deduct from the rating, but the instructions should address this. A plus is the plug holder. I like that it keeps the plug off the ground. It would be nice to have a second one for the original trailer's plug to keep that off the ground also while the unit isn't being used. Perhaps a double plug-holder could be shipped instead of this single-plug holder. In spite of the lack of a video/audio indicator, I would recommend this. It is much less expensive than the deductibles I already have to pay for repairs on my car and trailer. If it will prevent something similar from happening, it will be well worth the price. 341223


Comments

In the time since I got the Sway-Master, I have felt it activate a few times when we encountered some particularly bad roads in Vermont. Other than that, it is just there as insurance as stated above. I believe it is worth it and stand by my previous review comments.

StephenH - 02/12/2018

34627

- HA81775

by:


This is easily installed by the RVer. I did it in a few minutes. Use a punch to dimple your trailer tongue before drilling the holes for the included screws. This helps ensure the holes line up with the SwayMaster. I purchased it because of its plug-n-play simplicity. It's an inexpensive insurance policy against emergency sway situations. I also use a good weight-distributing-anti-sway hitch. We recently drove a twisty road in AZ at 50 mph (in control) and my truck's trailer-brake system showed that the trailer brakes activated so I believe the system does work as advertised. Otherwise it hasn't activated (no emergency sway situation) in about 5,000 miles of towing a 30 foot overall travel trailer. If you buy a unit, remember to unplug the trailer's seven-pin cord from the rear of the unit at your destination. If you don't it will continue to spin the gyroscope, applying unnecessary wear to it as well as drawing power from your trailer battery/batteries. 489305


6
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Ask the Experts about this Hayes Weight Distribution
Do you have a question about this Weight Distribution?


  • Anti-Sway Needed for 7K Aluminum Trailer Towed by 2015 Ram 2500
  • To determine the best weight distribution (WD) system for your towing application you need to add the loaded tongue weight (TW) of your trailer plus the weight of any cargo behind the rear axle of your 2015 Ram 2500. Once you know the total tongue weight you will then need to choose a WD system that has a TW range this number falls in the middle of. Keep in mind that a properly loaded trailer will have a TW of 10-15% of the weight of the trailer. With this in mind you will likely be...
    view full answer...

  • Will Hayes Electronic Sway Control System Work With GM Vehicles With Integrated Brake Controller
  • The Hayes Sway Master Electronic Sway Control System, part # HA81775 will work with your enclosed snowmobile trailer. If you have an integrated brake controller on your GM vehicle I am sorry but they will not be compatible. There are some GM vehicles, either Chevrolet or GMC that have tow packages without the brake controller and the # HA81775 would work. So, bottom line is if you have a GM vehicle with an integrated brake controller the electronic sway control system will not work...
    view full answer...

  • Sway Control for Raised Tandem Axle Trailer that has Weight Distribution
  • Short of replacing the weight distribution you already have to one that includes sway control the Hayes Sway Master Electronic Sway Control System # HA81775 is a great choice. Since it can be installed virtually anywhere on your trailer, and is so easy to install, it makes it extremely versatile. It uses a gyroscope to sense movement in the trailer and applies the trailer's brakes when necessary to keep it in line with your Jeep. It also uses GPS to detect your speed and determines how...
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  • Will the Hayes Electronic Sway Control System Part # HA81775 Work with Factory Brake Controllers
  • I called my contact at Hayes about the Hayes Sway Master Electronic Sway Control System part # HA81775 and they stated that they do not recommend using the above device on any vehicle with a factory integrated brake controller. Therefore no, the Hayes Sway Master Electronic Sway Control System will not work on your 2015 Ram 2500 with the factory brake controller. In order to use this device on your 2015 Ram 2500 you will need to replace the factory brake controller with an aftermarket...
    view full answer...

  • Can Hayes Sway Master Electronic Sway Control be Used with Tekonsha RF Brake Controller
  • From your vehicle's trailer wiring connector you'd want to plug in the Prodigy RF part # 90250 and then you'd plug the Hayes Swaymaster # HA81775 into that and from there your trailer's wiring. I attached a link to the RF brake controller instructions as well as a picture that covers how the Sway Master installs.
    view full answer...

  • What Is Needed to Use the Hayes Sway Master Electronic Sway Control System Part # HA81775
  • As long as your trailer has electric or electric-over-hydraulic brakes and the tow vehicle has a has a fully functioning 7-way then the Hayes Sway Master Electronic Sway Control System part # HA81775 will work well for you. You will not need any sort of progressive braking assembly or kit. If you don't already have a brake controller, I recommend using the Tekonsha Prodigy P2 Trailer Brake Controller part # 90885 which is one of our best selling brake controllers due to its ease of...
    view full answer...

  • Electronic Sway Control For 2016 Ram 1500 Towing Aluminum Motorcycle Trailer
  • Adding a weight distribution system will put the bottom of the system about 5 or 6 inches below the ball mount on your 2016 Ram 1500. I know that is what you are trying to avoid but ground clearance will be limited regardless of what system you use. You will need to check with the trailer manufacturer to see if a weight distribution system can be used with your trailer. There may be another solution for you though. Take a look at the Hayes Sway Master Electronic Sway Control System...
    view full answer...

  • Troubleshooting Sway Control Issue with Fastway e2 System
  • The Fastway e2 system you have should not need any additional sway control and won't work with any additional bars. The biggest issue when you experience sway with a system like the # FA92-00-1000 is either an underrated system or a poorly adjusted system. An underrated system doesn't account for the total tongue weight which includes the loaded trailer tongue weight as well as any additional cargo behind the rear axle of the tow vehicle. I've attached the installation instructions to...
    view full answer...

  • Can Hayes Sway Master Electronic Sway Control Be Attached To Trailer With C-Clamp
  • The Hayes Sway Master Electronic Sway Control, part # HA81775, has a gyroscope in the module so you will have to make sure it is very well secured in place so that it does not vibrate. I called my contact at Hayes and they said if you can secure it with a c-clamp and additional straps and keep it from moving when attached it should work just fine.
    view full answer...

  • Why is a Weight Distribution System Not Recommended on a 2018 Land Rover Discovery
  • The 2018 Land Rover Discover has an integrated air system that is designed for trailer stability so they recommend not using the Weight Distribution hitches because their integrated system is designed to help with vehicle sag. You can use your current weight distribution shank and head without the spring/sway bars if desired. That is what I'd do and save the additional cost. If you end up having some sway issues because you aren't able to use your weight distribution system with...
    view full answer...

  • Recommended Weight Distribution Hitch or Electric Sway Control for 2019 Coachman Apex Nano 185BH
  • For your 2019 Coachman Apex Nano 185BH, you don't need to use a weight distribution system but it may still be beneficial not only for sway control but also for the lift to reduce rear truck sag when towing. My recommendation is the Reese Strait-Line Weight Distribution with Sway Control # RP66073 because the dual cams and rolled trunnion bars will keep that light trailer tracking correctly behind your Titan XD. The bars will be required for that sway control which is the bigger issue...
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  • Recommended Sway Control for a 1,390 lb ProLite S Trailer
  • If you are anticipating high wind situations when towing your 1,390 lb ProLite Plus S trailer then adding a sway control system to your towing rig is a really good idea. Typically we recommend using a weight distribution (WD) system that has integrated sway control if your trailer weight is at least half of the weight of your towing vehicle. Since this trailer is pretty light though a WD system may not be necessary. We do have stand-alone sway control units available that install directly...
    view full answer...

  • Electronic Trailer Sway Control System for 2009 Audi Q7
  • You are correct that some trailer hitches are not rated for use with a mechanical weight distribution/sway control system, including the Curt Class III model # C13136 that you referenced. Please note this hitch does NOT fit your 2009 Audi Q7; it fits the Q5 from 2009 through 2017. This exclusion from using WD will be due to either the hitch's vehicle-specific design or the ultimate strength of the vehicle frame. In some cases components on the vehicle will require a hitch design that...
    view full answer...

  • Are Anti-Way Bars Recommended to Be Used with the Hayes Sway Master Electric Sway Control System?
  • The Hayes Sway Master Electronic Sway Control System - 1 to 4 Axles # HA81775 does not need any other anti-sway system to work properly. The system is designed to be used independently and uses an integrated gyroscope and gps monitor for sway and speed. It will apply electric braking as needed on your trailer to control sway and keep your trailer in line with your vehicle. You may use it in conjunction with a friction sway bar like # 17200 or a weight distribution system with integrated...
    view full answer...

  • Is the Hayes Sway Master Electronic Sway Control System Compatible with a Redarc Brake Controller
  • Fantastic news for you! The Hayes Sway Master Electronic Sway Control System # HA81775 is compatible with your Redarc brake controller. I have included a link to a video covering the features of the Sway Master system for you.
    view full answer...

  • How to Have Hayes Swaymaster and Prodigy RF Brake Controller Installed at Same Time on Trailer
  • From your vehicle's trailer wiring connector you'd want to plug in the Prodigy RF part # 90250 and then you'd plug the Hayes Swaymaster # HA81775 into that and from there your trailer's wiring.
    view full answer...

  • Mounting Hayes HA81772 Sway Master to Trailer Frame
  • According to my contact at Hayes, as long as the top of the unit isn't blocked and the unit is pointed in the correct direction so the trailer can be plugged into it, there aren't any mounting restrictions for the unit.
    view full answer...

  • Weight Distribution Alternatives for a 2013 Volkswagen Tiguan
  • I do have options for you but if the owner's manual for your 2013 Volkswagen Tiguan states not to use a weight distribution system then we cannot recommend against this. If you would like a bit more support and stability then I recommend using the Firestone Coil-Rite Air Helper Springs part # F4176 which actually installs inside the coil springs and can be adjusted for optimum performance.
    view full answer...

  • Can a Weight Distribution System be Used on a 2009 Kia Sportage
  • All of the trailer hitch receivers that we carry for your 2009 Kia Sportage, like the # 75561, cannot be used with a weight distribution system. If you have a different hitch than one we carry you'll need to check its specs to know for sure. To reduce trailer sway you are able to use a Sway Control Kit # 83660. It installs on the trailer tongue and can be removed easily by releasing two clips. It will need to be removed whenever you're backing up with the trailer. I've linked an...
    view full answer...

  • Can the Hayes Sway Master be Used Behind the Prodigy RF Brake Controller
  • I spoke with my contact at Hayes and they confirmed that the Sway Master # HA81775 is compatible with the Tekonsha Prodigy RF # 90250. You would want to install then just as you mentioned with the Prodigy RF connecting to your truck, the Sway Master behind that, and then your trailer into the Sway Master.
    view full answer...

  • Compatibility of Weight Distribution System or Sway Control on 2004 Toyota Tacoma
  • I have no idea why Toyota would put that in their owners manual unless their factory hitch option is not able to use weight distribution. There are some hitches that are not rated for using a WD system. When you say you have a reese hitch, I imagine it is the same as the Draw-Tite Class III hitch # 75078 because all their hitches went under that brand name a few years ago. That hitch is rated for 550 lbs tongue weight with weight distribution and 500 lbs without which is not a significant...
    view full answer...

  • Compatibility and Conversion of Hayes SwayMaster Electric Sway Control with 12-Pin Plug
  • The Hayes Sway Master Electronic Sway Control System - 1 to 4 Axles # HA81775 will be adaptable to a 12 way system and then back again if you use the 7-way like # 30717 and # H20046 . Then to combine the turn and brake functions prior to the unit use the Roadmaster Brite-Lite Wiring Converter # RM-732. If you need to convert it back following the unit, use # C56196 to separate the brake signal again. If you don't want to use all the US 7-Way adapters you can use the Autowbrake Electric...
    view full answer...


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Info for this part was:

Expert Research:
Michael L
Edited by:
Lindsey S
Expert Research:
Michael H
Expert Research:
Jameson C
Expert Research:
Adam R
Installed by:
Cole B
Expert Research:
Jeffrey L
Photos by:
Zach O
Updated by:
Sarah W
Written by:
Amanda M
Updated by:
Hannah L
Updated by:
Kristina F

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