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  1. Custom Fit Vehicle Wiring
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  4. Trailer Hitch Wiring
  5. 4 Flat
  6. Converter
T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector

T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector

Item # 118400
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Custom Fit Vehicle Wiring

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Tekonsha Trailer Hitch Wiring - 118400
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Quickly and easily install a 4-way trailer connector on your vehicle with this custom wiring harness. T-One connector plugs directly into existing wiring - no cutting, splicing or tapping required. Circuit-protected converter guards against shorts. 1-800-496-5010 to order Tekonsha custom fit vehicle wiring part number 118400 or order online at etrailer.com. Free expert support on all Tekonsha products. Guaranteed Lowest Price and Fastest Shipping for T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector. Custom Fit Vehicle Wiring reviews from real customers.
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  • Reviews (178)
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  • Why etrailer?

Tekonsha Custom Fit Vehicle Wiring - 118400

  • Custom Fit
  • Trailer Hitch Wiring
  • 4 Flat
  • Converter
  • Tekonsha

Quickly and easily install a 4-way trailer connector on your vehicle with this custom wiring harness. T-One connector plugs directly into existing wiring - no cutting, splicing or tapping required. Circuit-protected converter guards against shorts.


Features:

  • Provides a 4-way flat trailer connector at the back of your vehicle to power your trailer's signal lights
    • Compatible with 5-pole, 6-pole and 7-pole adapters (sold separately)
  • Connects quickly and easily - no cutting or splicing of wires
    • Locate connection points behind tail lights
    • Plug in T-connector
  • Includes circuit-protected tail light converter to ensure that your vehicle's wiring matches that of your trailer
    • Provides protection against electrical shorts and overloads
  • Constructed of 16-gauge bonded wire
  • Comes with dust cap for 4-way flat connector


Specs:

  • Maximum amperage:
    • Stop/turn lights: 2.1 amps per circuit
    • Tail lights: 5 amps per circuit
  • 1-Year limited warranty


Installation

This custom-fit T-One connector plugs into your vehicle's wiring harness, which is located behind the driver's-side and passenger's-side tail lights. You will have to remove the tail light assemblies to access this harness.


T-One Connection Location Points Behind Tail Lights

Once installation is complete, the 4-way flat connector will be stowed beneath your vehicle, near the trailer hitch. A mounting bracket (sold separately) is recommended to keep the connector secure.


It is recommended that you use a small amount of grease on all electrical connections - the plugs on your automobile and the 4-pole connector itself - to help prevent corrosion.


Circuit-Protected Tail Light Converter

A tail light converter is built into this T-One connector. Because most trailers run on a two-wire system - wherein the brake and turn signals are carried on one wire - the separate brake and turn signals from your vehicle's three-wire system need to be combined so they are compatible with the wiring system of your trailer. The tail light converter combines the brake and turn signal functions of your automobile so that they run on one wire to properly activate your trailer's tail lights. Note: This will not affect how the tail lights on your vehicle operate.


This converter safeguards itself and your vehicle against possible electrical shorts and overloads with integrated short circuit protection. Just install the connector as indicated and rest assured that the wiring system of your vehicle will remain feedback-free.



118400 Tow Ready T-1 T-Connector - 4 Wire

Installation Details 118400 Installation instructions

This Product Fits The Following Vehicles



California residents: click here



Customer Reviews

T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector - 118400

Average Customer Rating:  4.7 out of 5 stars   (178 Customer Reviews)

Quickly and easily install a 4-way trailer connector on your vehicle with this custom wiring harness. T-One connector plugs directly into existing wiring - no cutting, splicing or tapping required. Circuit-protected converter guards against shorts.

by:
2008 Honda Ridgeline

Routing the wiring wasn't too difficult. Trying to get the passenger side to plug into the tail light harness was a bit of a challenge, until I removed the factory spacer inside the plug. All the lights work fine. I'll give another review after I install the hitch.


Comments
Harness is working great with no problem. Its a perfect fit for my truck. The 7 way and 4 prong plugs work fine .
Terry - 04/30/2022


by:

I’ve been an etrailer customer for 10 years because of their customer service & easy to use website.
Every hitch, wiring harness or accessory I’ve installed on vehicles from 1998 to current has never been an issue.
When my sons truck died before his hitch set up was installed their return policy was simple.




by:

I was very happy with my purchase, customer service experience, and the ease of installing the hitch and wiring. The hitch was actually quite easy to install. I was able to install it my myself in about 20 minutes. One end didn’t align with the holes in my frame (could have been off on my truck), but a couple of whacks with a mallet and it lined up perfectly. The wiring took a lot longer than anticipated, but this is mostly due to me wanting everything routed in a way in which it was hidden. An easy afternoon of work to install everything.




by:

Product as described. Four stars instead of five because the wiring harness wouldn’t fit as delivered. Three of the four plugs to the tail lights plugged right in no problems. The fourth wouldn’t fit. There were plastic prongs down in the plug that prevented the plug from seating. After examining it I found an extra plastic insert that was blocking the plug. It came right out with needle nose pliers and then everything worked.

I’m guessing this is a quality control issue that etrailer cannot control.




by:

Installed with ease and has worked everything we connect the trailer to it and head out camping. Guys were great to work with.




by:

The product is perfect and amazingly easy to install. I’m not a mechanic by any means but I did this VERY easily. But as good as the product is, the instruction video is simple and easy to understand and that is what made the project perfect in my mind. I’d recommend this solution a million times over.




by:
2008 Honda Ridgeline

Had a problem installing but after speaking with customer service I learned it was a vehicle side issue. Etrailer was absolutely correct and their instructions enabled me to solve the problem in 60 seconds. I appreciate that. Otherwise this product was a snap to install and it is working nicely. Installed on a 2008 ridgeline needing a taillight converter between vehicle and 7 blade rv. The passenger side wouldn’t plug in. Turns out when I pulled the vehicle connectors apart a piece from the male side was stuck in the female side. Pulled that out and put it where it belonged and good to go. Who knows how long it might have taken me to figure that out on my own.




by:

I buy Hopkins Plug-in wiring harness with 4-pole connectors. Good product, simple, great instructions. Use for one year, have no problems.


Comments
Working great, use two years, run 70-75 mph . Good trailer.
Vitaliy Z - 12/24/2020


by:
2006 Honda Ridgeline

The tow wiring harness for my '06 Ridgeline arrived as promised. Instructions included in the package were so so, but there were YouTube videos that were perfect. Installation was difficult because I wanted the wires routed in protected locations. The right tail lamp wire almost didn't reach because I couldn't get the large connectors through the most efficient route/holes. It just did make it. I also needed more of the large black cable ties. Overall, I would give the product a B+ and the seller an A. No picture because its all buttoned up, so it looks stock.....


Comments
Hi David were you able to actually get all the wires routed out of the way of everything - and not exposed during normal use to the vehicle ?? Im curious especially about the way the wires have to cross to both taillight assemblies ?? Please let us know ThanksDaryl
-- comment by: Daryl F - 03/05/2016


by:

Outstanding company to deal with. Thank you so much




by:
2013 Honda Ridgeline

First time ordering from E-trailer, this was an outstanding experience. I ordered a direct fit wiring harness for my 2013 Honda Ridgeline the product shipped on time and the ease of following step by step instructions made the install very simple. I would not hesitate to order from E-trailer again in the future. Thanks, Greg G.


Comments
Everything is still great with the harness, absolutely no problems. I really mean it when I say this is a simple and easy install item. I really appreciate the follow up and thanks again for a great product. Greg G.
Greg G - 01/11/2015


by:

Great product! Great instructions. Easy to install..




by:
2007 Honda Ridgeline

This was another easy product from etrailer that I have purchased and installed myself all within one hour the instructions are simple & accurate but if you need further information just go online to see their videos this is a class "A" outfit to deal wit hand purchase from. They have my business from this day forward great products, great delivery and easy to install by DIY folks...


Comments
Everything is working perfect and thank you for the follow up. I will be buying more when the time comes that I need something you carry and I recommend you to all of my friends and colleagues
kevina - 07/05/2018


by:
2008 Honda Ridgeline

easy to install




by:
2006 Honda Ridgeline

I recently acquired an eTrailer Plug & Play Wiring Harness (#118400) to complete the 4-7 Electrical Connection for a Reese Trailer Hitch which had been previously installed on an ‘06 Honda Ridgeline Truck. The P&P Wiring Product was as advertised and the eTrailer Online WEB site greatly facilitated the acquisition process. The Iinstallation Instructions included in the product package were both concise and clear. Additionally, the Supplemental Online Videos further enhanced the visual concept of the proper installation procedure. Note: However, rather than using the extended “clamp-on” bracket to mount the 4-7 Electrical Connection Plug, I altered the standard 90-degree Mounting Bracket to a Closed Angle of 75-degrees which allows the back of the 4-7 Electrical Connection Plug to neatly fit between the round tubular Reese Trailer Hitch and the frame cross member whereby completing the installation without precariously extending the Mounting Bracket or exposing 4-7 Connector and the associated wiring as a low-clearance hazard. I highly recommend this well designed produce.




by:

The wiring and connections were complete and solid, the length of the wiring was adequate, the zip ties for holding the wiring in place were only 6" and needed to be at least 11" for my Draw Tite trailer hitch installation.
i had to buy a bag of black 11" zip ties to complete the job and make it look solid, a zip tie can always be cut off if its too long.
The directions were clear and straightforward, it was a nice Tekonsha product, i have used a Tekonsha brake and trailer harness before and i am confident i will get many years of use from this installation.




by:

Great product, easy install, was delivered fast! Just what I needed for our first camping trip with the Ridgeline.




by:
2008 Honda Ridgeline

Amazing service! Ordered a hitch and wiring for a 5 year old truck, and they not only had them in stock, it they were delivered free in 3 business days!
Best internet ordering experience I've ever had!


Comments
I love it. Perfect fit, easy install, works great!
R. T - 03/03/2015


by:

This is a fairly well designed product but definitely needs some improvements. The wiring needs to have a protective sleeve/covering installed over it before installation or else the wires are totally exposed to chafing when routed along the body, frame and hitch. I bought protective sleeve material for less than $5 at Home Depot.

The other needed improvement is something other than double sided tape to attach the control unit to a bare metal surface. I'm not at all confident the tape will last the life of the vehicle. I used multiple zip ties to ensure when and if the tape fails, the control unit will not be lost.

I would recommend this product and the service at etrailer was excellent as usual.




by:
2006 Honda Ridgeline

Installed with a Hidden Hitch. The wiring harness took about 20 minutes, which included extra time routing the harness. The video was helpful in how the factory plugs disconnected from the body clips. Could have used a couple of longer zip ties for securing the harness to the hitch in more areas, if it did would be 5 stars.




by:
2007 Honda Ridgeline

The installation took me two hours to complete. The video and written instructions were helpful but neither addressed all the unforeseen problems encountered. First of all, the process for disconnecting the wiring plug from the clip on the truck body on the driver's side of the 2007 Honda Ridgeline is different than on the passenger side. On the driver's side of the Ridgeline you have to depress the locking device and pull up to disconnect the plug. On the passenger side you must depress and pull down. I also had difficulty attaching the T-Connector Black Box to truck body. The wiring for the Black Box is so short that I had to lay on the ground and extend my arm up a narrow cavity and attach it the box to the body by feel. I expect that the reviewer who indicated that they installed the wiring harness in 20 minutes had some prior experience installing this wiring harness. A person installing one for the first time will need more than their lunch break to complete the installation. That said, the new wiring harness works great and is a big improvement over the cut and splice routine. I would buy it again.




by:

Worked just fine. Nice plug and play. Spoke with sales rep and recommended this model harness over the other model that etrailer stocks due to its compatibility with LED lights (if needed). Installation instructions could have been a bit better by indicating that the large module should be mounted low on the frame to allow the passenger side wires to reach.




by:
2007 Honda Ridgeline

Wiring worked out great, went on with ease and came with easy to follow step by step instructions. no wire cutting no splicing! just plug in and its ready to use


Comments
After one year, I’m still towing my boat around and everything works perfect! I will definitely be purchasing again on any future vehicles. Highly recommended!
Daniel - 12/30/2019


by:
Honda Ridgeline

Great product! The trailer wiring harness for my honda Ridgeline, ordered a new one from etrailer.com Delivered quickly, installation was very easy, works great, great product, and service. I would buy from them anytime




by:
2008 Honda Ridgeline

Saw the youtube video, wrote down the web site and part # 118400 and went to etrailer.com watched another video of the part installation and wondered, is it really that easy, it was!! The product was high quality and the installation instructions on the video were spot on. My bass boat needed new lights on the trailer and what I thought was a blown bulb turned out to be a bad module on my old harness. The quality of the product was only part of this great experience, fast shipping, but the really great thing was the video on how to install this harness on my Ridgeline. Good job etrailer!! All my fishing buddies have already heard about my experience. Thanks, a grateful customer, David.



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Show More Reviews

See what our Experts say about this Tekonsha Custom Fit Vehicle Wiring



  • Recommended 4-Pole Wiring Harness for 2006 Honda Ridgeline
    Since your light bar has a 4-pole connector you can install it most easily by adding Tekonsha 4-pole harness # 118400. This installs easily by plugging in to your Ridgeline's tail light connectors. No cutting or splicing is required. Please refer to the linked video.
    view full answer...
  • Troubleshooting Bizzare Trailer Light Blinking
    To me it sounds like there was a short on your trailer which caused the Tow Ready Wiring Harness # 118400 that you referenced to short out as well. Bizarre trailer light behavior is usually caused by a shorted out converter box or bad tail light grounds. I would check the condition of the grounds of the tail lights first. Some assemblies ground through the mounting hardware, if that is what you have then you should check to make sure the assemblies are attached to a clean, metal surface. Since...
    view full answer...
  • How to Disconnect the Factory Taillight Connectors on a 2012 Honda Ridgeline for Trailer Wiring
    Disconnecting the factory taillight connectors on the 2012 Honda Ridgeline requires pressing on the correct locking tab on the wiring connector. I produced a short video showing how to disconnect the wiring harness so you can install the T-One Wiring Harness, # 118400, on your vehicle.
    view full answer...
  • Where Should the Converter Box be Mounted on a 2006 Honda Ridgeline for Wiring Harness # 118400
    The instructions for wiring harness # 118400, see link, do not specify it but if there is room behind the driver side tail light assembly, or a little lower, the converter box will go there. Make sure the area where it will attach to is clean so the double-sided tape will stick.
    view full answer...
  • Left Turn Signal and Brake Lights Do Not Work On Trailer or 4-Way on 2006 Honda Ridgeline
    You have done all of the correct testing and it does indicate that the converter in harness # 118400 has gone bad and needs to be replaced. There could be any number of reasons for a converter to go bad. It could be a short on the trailer that blew the box, protecting the vehicle wiring like it was designed. Check the trailer to make sure the grounds are all attached to clean bare metal surfaces. Also make sure that the trailer and vehicle side connectors are free of dirt and corrosion....
    view full answer...
  • Wiring Harness for a 2008 Honda Ridgeline
    Currently the only harness that we offer for the Ridgeline, item # 118400, plugs into the existing factory plugs behind the taillights.
    view full answer...
  • Troubleshooting Turn Signal Issue with Wiring Harness 118400 on a 2007 Honda Ridgeline
    I would check a few things first, before replacing the unit. First, you should check the ground wire at the screw you should have installed and make sure that it is firmly connected to a clean piece of metal, i.e. a location without paint, rust, or buildup. I also recommend checking the ground wires on your trailer, including the ground on the trailer connector, and any trailer lights. If your trailer lights are grounded through the mounting hardware, make sure that no rust or buildup...
    view full answer...
  • Reverse Lockout Not Working Using 4-Way to 7-Way Adapter on 2008 Honda Ridgeline
    A 4-Way trailer wiring harness such as # 118400 has the basic lighting functions but does not have a reverse light function and that is what you need to activate an electric reverse lockout on a surge coupler. Since you already have the 4-Way plugged into an adapter to use the 7-Way on the trailer connector you just have to activate the reverse light circuit on that 7-Way adapter. To do this look on the back of the 7-Way adapter. There are likely some wires not connected to anything....
    view full answer...
  • Trailer Wiring Harness Recommendation for a 2013 Honda Ridgeline
    For a 4-way wiring harness for your 2013 Honda Ridgeline you would want to get a Tow Ready Custom Harness # 118400. I attached an installation video for this kit as well as installation instructions for you to check out. Current pricing is available on the product page.
    view full answer...
  • 2007 Honda Ridgeline Trailer Wiring and Brake Controller Install Kit Recommendation
    You will need to start with a 4-way (if you do not have one). For that you would want the # 118400. 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.
    view full answer...
  • Troubleshooting No Power on 4-Way Harness for 2006 Honda Ridgeline
    The Tekonsha T-One Vehicle Wiring Harness # 118400 referenced in your question is indeed confirmed to fit your 2006 Honda Ridgeline. If you are receiving no power on any of the circuits of the installed 4-Way, I recommend completely removing the wiring harness and simply re-installing it. It's possible that you may have missed something during the initial installation that you will catch when going through the steps again. Sometimes there will be a couple of ports, similar in design,...
    view full answer...
  • Trailer Wiring Kit For Safe Operation and Warranty on a Honda Ridgeline
    To answer your question, there is a federal law that says that the vehicle manufacturer must provide warranty repair on the vehicle as long as the aftermarket device is not the actual cause of the malfunction or breakdown. In that case you would be responsible for any repair. That being said, I have never ran into a situation where trailer wiring caused a customer to be declined for warranty service. Most car dealers will service the vehicle under warranty no matter the cause of the malfunction,...
    view full answer...
  • Trailer Hitch Recommendation for a 2008 Honda Ridgeline Towing a Trailer and Motorcycle
    We offer two trailer hitches for your 2008 Honda Ridgeline by Curt # 13385 and Draw-Tite # 75280. The Draw-Tite has a slightly higher tongue weight capacity at 750 lbs than the Curt hitch, but the Curt hitch is more economically priced. The tongue weight capacity of the Curt hitch is 500 lbs. Both trailer hitches have a maximum gross trailer weight capacity of 5,000 lbs. As long as the weight of your trailer and motorcycle do not exceed GTW or TW capacities of the hitch or your vehicle,...
    view full answer...
  • Recommended Wiring Harness for Honda Ridgeline with LED Lights
    The Curt Trailer Wiring Harness you referenced, part # C56175, is not recommended for use with vehicles that have LED lights. However, I can offer you an easy solution that will not require any cutting of wires. TowReady T-One 4-Pole Trailer Wiring Harness # 118400 is a plug-and-play harness that simply plugs inline to your tail light assemblies without the need to cut or splice wires. My contact at TowReady confirmed this harness works both with vehicles and/or trailers that use LED-type...
    view full answer...
  • Trailer Wiring Harness for 2007 Honda Ridgeline that Will Work with LED Trailer Lighting
    The Curt Trailer Wiring Harness that you referenced, part # C56175, is not recommended for use with vehicles that have LED lights (but is compatible with trailers that have LEDs). This harness requires you to cut and splice wiring to install it. I can offer you an easier solution that will not require any cutting of wires. TowReady T-One 4-Pole Trailer Wiring Harness # 118400 is a plug-and-play harness that simply plugs inline to your tail light assemblies without the need to cut or splice...
    view full answer...
  • Recommendation to Install 5-Way Connector on 2008 Honda Ridgeline
    The Tekonsha Modulite Protector 5-Way Flat # 119177 referenced in your question is a universal harness that can be installed on your 2008 Honda Ridgeline. This hardwire kit will require you to splice in all of the wires to the tail light wires on your Honda Ridgeline to give you the needed 5-Way to connect with your boat trailer. With this in mind, an easier option will be to simply install the Tekonsha T-One Vehicle Wiring Harness # 118400. This custom-fit, 4-Way harness will connect...
    view full answer...
  • Trailer Hitch and Wiring Recommendation for 2007 Honda Ridgeline
    The most concealed trailer hitch we have for your 2007 Honda Ridgeline is the Curt hitch part # 13385 which only will have the hitch opening visible underneath the rear bumper. See attached picture to see what it looks like installed. For trailer wiring you'd then want the Tekonsha kit part # 118400 as the Tekonsha brand it the most reliable option we carry. If you wanted to do some towing you might be interested in etrailer ball mount kit # 989900. It comes with 2 ball mounts; one with...
    view full answer...
    Image 1 for
  • Recommended Trailer Wiring Harness for a 2007 Honda Ridgeline
    The trailer wiring harness options we have for a 2007 Honda Ridgeline all have built-in protection to isolate itself from the vehicle in the event of a fault. That said, the best one we offer is the T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector part # 118400 which in our experience is the most durable and reliable option. It offers plug-n-pay installation, has diodes to prevent damage to the vehicle wiring, and pulls power from the battery so you won't strain the vehicles...
    view full answer...
  • T-One Wiring Harness To Replace Factory Trailer Wiring On 2008 Honda Ridgeline
    Yes. The T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector, # 118400, can be used to bypass factory tow package wiring in your 2008 Honda Ridgeline. As long as the functions at your tail lights are working correctly, this wiring harness can be used to give you the 4-way flat connector. Before replacing, you may want to check fuses and put a circuit tester like # PTW2993 on the wires to test functions.
    view full answer...
  • Trailer Hitch and Wiring Recommendations for a 2007 Honda Ridgeline
    Hidden Hitch and Draw-Tite are from the same parent company. Hidden Hitch has actually been discontinued but the 2 are identical except for the stickers that are on them. I would go with Draw-Tite hitch # 75280 for your 2007 Honda Ridgeline since it is the brand that is going to continue on. I have linked a video showing an example installation for you. If you plan on doing some towing I recommend etrailer ball mount kit # 989900. It comes with 2 ball mounts; one with a 3/4 inch rise or...
    view full answer...
  • Recommended Trailer Hitch Receiver for 2006 Honda Ridgeline
    For your 2006 Honda Ridgeline I recommend the Curt Trailer Hitch Receiver - Custom Fit - Class III - 2" # 13385. This is a Class III hitch with a 2" receiver and a concealed cross tube. It has a maximum gross trailer weight of 5,000 lbs and max tongue weight of 500 lbs. It also comes with a limited lifetime warranty. If you plan on doing some towing and need wiring, I recommend the T-One Vehicle Wiring Harness # 118400. This plugs directly into existing wiring and will provide you with...
    view full answer...
  • Missing Towing Module on 2007 Honda Ridgeline
    I am not sure what towing module they are talking about. If your 2007 Honda Ridgeline came with the factory tow package that included a 7-Way trailer connector at the back then the only reason any part of the towing package would be missing is if someone removed it. It is also possible that the 7-Way on the vehicle is not a factory 7-Way. So it would appear that you either need to have that missing part installed or hardwire in a different 7-Way connector. It is probably less money to...
    view full answer...
  • Installing a 4-Pole to 7-Way Adapter on 2014 Honda Ridgeline
    Once the # 118400 is installed, you can use the # ETBC7 install kit. The kit includes all the necessary wire, circuit breakers and a # 37185 adapter to convert the 4 pole to a 7-way. The power from the brake controller, as you said, is delivered on the blue wire. The black wire would run to the positive battery terminal through a 40 amp circuit breaker like part # 9510. This circuit would serve as a 12-volt accessory power feed to the trailer. There's no need to hook up the 12-volt circuit...
    view full answer...
  • Factory Trailer Brake Controller Plug Location for a 2011 Honda Ridgeline
    From what I was able to find, if your 2011 Honda Ridgeline has a factory installed 7-Way trailer connector, then the harness will be located underneath and to the left of the steering column taped to another wiring harness near the brake pedal. If your Ridgeline did not come with a factory installed 7-Way then you will need to hardwire the brake controller by first installing a 4-Way, if needed, # 118400, and then a 4 and 7-Way Installation Kit, # ETBC7. I have included some links to FAQ...
    view full answer...


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