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  1. Custom Fit Vehicle Wiring
  2. CURT
  3. Custom Fit
  4. Trailer Hitch Wiring
  5. 4 Flat
  6. No Converter
Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector

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

Item # C56020
Our Price: $38.45
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Custom Fit Vehicle Wiring

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Quickly and easily install a 4-way trailer connector on your vehicle with this custom harness. T-connector plugs directly into existing wiring - no cutting, splicing or tapping required. 1-800-940-8924 to order CURT custom fit vehicle wiring part number C56020 or order online at Free expert support on all CURT products. Great prices and Fastest Shipping for Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector. Custom Fit Vehicle Wiring reviews from real customers.
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  • Reviews (143)
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CURT Custom Fit Vehicle Wiring - C56020

  • Custom Fit
  • Trailer Hitch Wiring
  • 4 Flat
  • No Converter
  • CURT

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


  • 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
  • Comes with dust cap for 4-way flat connector
  • Limited 1-year warranty


This custom-fit T-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 and interior trim paneling to access this harness.

Once installation is complete, the 4-way connector will be stowed in an out-of-the-way location within your cargo area.

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.

56020 CURT T-Connector - 4 Wire

Installation Details C56020 Installation instructions

This Product Fits The Following Vehicles

California residents: click here

Customer Satisfaction Score:

Customer Reviews

Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector - C56020

Average Customer Rating:  4.7 out of 5 stars   (143 Customer Reviews)

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

2008 Ford Van

I had the wire harness installed in 20 minutes. fantastic .


Very durable and easy installation. I’ve made multiple 400 mile trips with 6x12 uhaul trailer full of custom cabinets (easily a few thousand lbs) and have had no trouble at all. I installed the hitch in about an hour in the dead of winter. Would’ve taken half the time if it wasn’t so cold.


Easy installation works great!



Works good


Worth spending the little extra to get this custom made quality kit. It was very easy to install and is still working great.

2006 Ford Van

Father put this on his van within minutes. Haven’t tested it out with the trailer yet, but installation was a breeze

2013 Ford E250

The product is great. It went on a 2013 Ford E250. Loved the factory connections. It made the install easy. I ran the harness down through the opening for the spare tire lock instead of letting it hang out the underside of the rear door. Also, I ran the driver-side line under the plastic molding along the floor as opposed to going over the door frame. I had to do that since I ran the harness out the spare tire lock opening. I wanted this harness to remain in place all of the time without worrying about damaging it during loading and unloading.



Still good. No problems with this product, at all.


Excellent experience. Customer service person was very knowledgeable. She found the right part for my van quickly. She asked several questions to make sure I was getting the right pat and also everything else I would need for the install. She shipped the hitch and electrical assembly the same day for next day delivery. As soon as it shipped she sent my tracking number and followed up with me a soon as it arrived to make sure everything was good.

My mechanic had no problem with the install - perfect fit. This is my third order with etrailer. I'll ever buy any where else.



Everything still working flawlessly Thank you

2005 Ford Econoline

I have ordered from this site before and never had any problems. I was disappointed in this purchase though because it describes the Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector - C56020 to fit ANY 04-13 Econoline Van which is not true. It DOES fit any passenger or cargo Econoline Van. If you own a Regency(conversion style) van it does not fit without extreme modifications. is an amazing company and has always been easy and great to deal with! I love this site and will continue to use them!

Etrailer Expert

Patrick B.


Our hitches and wire kits are designed to fit OEM production vehicles, as they roll off the assembly lines. Aftermarket modifications, including conversions, make changes to the vehicle and some can affect compatibility. A van conversion involves major modifications including changes to the electrical systems.

2007 Ford Van

The product and price is fine. The service by etrailer is terrible and it took a month to receive my order. I called in to cancel the order and they sent me two wiring harnesses (???) and also didn't cancel the order. I have emailed three times trying to return the items and no one follows through. Most of the correspondence is automated with fake human names so the buyer can't tell if they are talking to a human or robot. I will never buy from etrailer again.

Etrailer Expert

Katrina B.


It is unfortunate that you had such a bad experience with us. I have sent this over to our customer service team for them to better assist you.


Within 3000 miles the wires came loose from the connections and shorted the light system, unfortunately withing a few minutes of this happening, I was stopped by a office. I could have gotten a ticket but instead was given a warning. Had to re wire on the spot around the connections to be able to move the van.


Item was fine but etrailer was really challenged at providing customer service. The automated system made mistakes and the rep sent two parts on accident and eventually I was able to return but it wasted some of my work time

2011 Ford Van

fit and worked perfectly. Would be nice if a piece of sheathing to protect the wires where it has to go over pinch welds behind the plastic trim panels were included. Otherwise a dozen wraps with electrical tape takes care of that.



Works perfectly. Lookig back however I wish Id gone to the trouble of installing a 7-way brake harness

2010 Ford Van

Easy to install, good fit to existing wiring, although the pigtail to the trailer plug could be a little longer (6" more?), but long enough for my trailer wiring to reach the plug. I think I should have bought the unit that had a control box included, because my turn signals flash as if there's a bulb out from the extra draw to the trailer (only turn signals, NOT with the 4-ways . . . ). Not a big deal, gets the job done, the fast signal is a small issue.


Fine. The directions and video could be improved since no one mentioned the back up lights really did not need to be involved with the connections. Just the signal and brake and lights are unplugged and replugged. Textbook vs reality.

Craig D.


Just fine.

2012 Ford Van

this wire harness ws put on 2012 Ford van, it was easy and fast, the quality of the
components' was great, compared to other products that I had purchased at
Harbor tools. Great product and easy instructions.

Daniel P.


Working just fine , and so easy to install, thanks

2012 Ford Van

Connectors did not fit through grommeted opening on floor. Wound up cutting the grn/wh wire and fed from top down then spliced them together. Not ideal but better than enlarging opening in floor. Connectors on taillights fit well. Overall happy with item.

Etrailer Expert

Jenny N.


For this harness you would want to remove the grommet and cut a slit large enough to route the custom wiring harness though. I recommend viewing our video install on a 2011 Ford van.

2006 Ford E-250

Customer service was great. Had to call them to discuss my needs, they knew what they were talking about and sold me the right parts. Install was simple when following the instructional video they have on this site. Very nice having that resource, more helpful than a phone call because you can pause it. :) I installed a flat four and a seven pole with a trailer brake controller to my 2006 E-250 van, worked the first time with no blown fuses like the old days.
Alpena, MI

2005 Ford Van

I ordered a Curt trailer hitch receiver and the Curt T connector wiring harness from e-trailer for one of our work vans. It was here in a couple days. I watched an installation video on e-trailers website and had everything installed, including the wiring harness in about 30 minutes. It was a piece on cake. E-trailers website makes it very easy to find what equipment to use on your rig. I will most certainly go through e-trailer again!!!!!!!!!!!


As promised the harness wired up directly to the existing vehicle wiring harness the instructions were clear. Also the trailer hitch was very easy to install, and the video on your website is excellent. I would certainly recommend these products and your company to anyone in search of a trailer hitch.

2004 Ford Van

Simple installation if used as suggested. I installed this a little bit different than suggested. This was intended to be installed and routed into the cargo area of the E350 van. We didn't want the wires in that area due to constant use and fear of damage. We drilled holes under the tail lights to route wires out side the van. This also required that we cut the harness wires after the connectors to route the wirw. Installed we had no issues. This just took a little thought to make it work to our requirements.


Simplified the addition of a towing package. Wires allow electrons to flow effortlessly while creating a warm glow across the resistive lighting elements. Havent been so happy since the day of my wedding, birth of my son! If I had use for them I would purchase like 100! Best financial decision I could have made and a very solid product!

2007 Ford e-350

This harness is truly plug-n-play. Couldn't be any easier. If you know how to use a screwdriver, you can install this. Put it on an '07 E-350 Ford van, and it works great. Karen @ etrailer knew just what I needed & recommended this product, and I'm glad she did. Thank you Karen!!! 1st time ordering from etrailer, and I will certainly order from them again!!

James B.


The plug-n-play wiring harness has been working flawlessly. I couldnt be any more satisfied. I also ordered a custom fit hitch receiver at the same time, and it has been great. Installation instructions were very clear, and installed it in about 10 minutes with no drilling whatsoever. Just what I wanted & needed. The best part... everything was shipped to my doorstep and I saved over $100 from my local auto parts store. Im a very satisfied customer, and have recommended etrailer to all my friends.

2004 Ford Van

This product is great! After buying the standard U-Haul wiring kit, and then spending hours taking apart the back of my E-350 and the wiring bundles only to find out that the wiring colors didn't match what I needed to splice into, I gave up and did some more on-line research. Thankfully I found this product, which is made by the same manufacturer as my hitch. Installation was straightforward and went without a hitch (no pun intended), and it worked perfectly on the first try and ever since. Thanks!

2014 Ford Van

Thanks etrailer. Everything about this transaction was great. Easy to use website, great information and tutorial videos. Product arrived fast and installation was a snap, (less than 3 hours for hitch and wiring by myself). No drilling, cutting, wire splicing or frustrations, what a relief! I will definitely use etrailer again and recommend you to all my family and friends for their towing needs.

You guy's ROCK! Keep on Towing!

2011 Ford Van

The hitch that i purchased is better looking than i expected, it took me less than 30 minutes to install, no drilling required. The light harness couldnt been more easier to install. Now i can tow my gear every where! With my Ford 2011 E350 make buying gear for your vehicle easy , even when your not sure what products work best for you. Plenty of information
Love the videos and fotos.

Show More Reviews

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

  • Connection Point for Valley Custom Fit Vehicle Trailer Wiring, # 30218 for a 2004 Ford E-150 Van
    When installing the Valley Custom Fit Vehicle Wiring, # C56020, for Ford E-series vans, you will just need to plug in the connectors on the wiring harness to the connectors behind each of the tail lights. The bundle with the yellow, brown, and white wires goes to the left (driver side) tail light. The bundle with the green and white wires goes to the right (passenger side) tail light. I have included a link to the installation details for reference.
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  • Troubleshooting Stop/Blinker Not Functioning on a 2007 Ford E 250
    If both the stop/turn signal functions aren't working on the 4-way of your 2007 Ford E-250 the problem is most likely a towing fuse or relay under the hood of the vehicle. Check the fuse/relay boxes for towing related fuses/relays and replace as necessary. I attached a help article on troubleshooting 4-ways for you to check out as well.
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  • 4-Way Trailer Wiring Harness Recommendation for 2004 Ford E-450 RV
    The 4-way trailer wiring kit you need for your 2004 Ford E450 RV is the Curt 4-way part # C56020. This is a custom fit, easy to install harness. I attached an install video for this kit for you to check out as well.
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  • Locating Connection Points on a 2007 Ford E-350 Van to Install Custom Fit Vehicle Wiring # C56020
    The connection points to install the Valley Custom Fit Vehicle Wiring, # C56020, on your 2007 Ford E-350 van are located behind each of the taillights. The plugs on the connectors plug in line with those on your vehicle taillights. I have included a link to the installation details for the harness below.
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  • Will the Curt T-Connector Vehicle Wiring Harness # C56020 fit a 2004 Ford E-250
    Yes, the Curt T-Connector Vehicle Wiring Harness # C56020 that you referenced fits 2004-2010 Ford E-150, E-250 and E-350's so it would work for you. I attached an install video for you to check out also.
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  • Trailer Wiring Harness for 2006 Ford E-350 Cutaway
    The correct wiring for your 2006 Ford E-350 Cutaway is the Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # C56020. I've added links to a pair of video reviews on this product for you to take a look at.
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  • Replacement Trailer Wiring Harness on a 2010 Ford Van
    I do have a replacement 4-way option for your 2010 Ford Van, but it doesn't quite install like your factory harness did. You'll need the Curt # C56020 which plugs in inline of your tail light connectors and gives you the functional 4-way connector you're looking for. I have attached an installation video of the # C56020 for you to take a look at.
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  • Ground Wire Problems With 7-way Adapter On 2008 E350 Econoline Van
    You went the right way when you checked the ground wire first. You will need to make sure all of your ground connections are good. The ground connection at the vehicle is especially important because it must travel through the connector to the trailer frame. The connector on the trailer should be secured to a clean surface on the trailer frame and each taillight assembly must be grounded either through the mounting bolts or a separate wire from the taillight to the trailer frame. When...
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  • Is a Converter Box Needed for Trailer Wiring on a 2008 Ford E-350
    For starters, the Curt Trailer Hitch Receiver part # 14055 is an excellent option for your 2008 Ford E-350 and will work well for you. It is a Class III hitch with a 2" receiver tube opening. I have attached a sample installation video on this hitch for you as well. In regards to trailer wiring, the converter box has nothing to do with the reverse sensors on a 4-way harness. The converter box helps with power drawl on the vehicle's electrical circuit. In some cases the vehicles factory...
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  • Trailer Wiring Harness for a 2012 Ford E-250 Van
    Some 2012 Ford E series vans will have a factory plug and some will not. If your van came with a factory trailer connector then the wiring is already there and active. But if it did not come from the factory with a trailer connector, the factory wiring may be there but it is probably not active. In that case you will need a harness that plugs in line with the van tail light wiring, # C56020, or # 118551. The Curt harness is a non-powered harness while the Tow Ready harness requires a connection...
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  • Replacement 4-Way Trailer Wiring for 2007 Ford E250
    If you are needing to replace the 4-way on your 2007 Ford E250 you can use the Curt T-Connector Vehicle Wiring Harness, # C56020. If you are actually looking to convert the 4-way to a 7-way you will need to use adapter # 37185. Your current 4-way will just plug into the 4-way plug on the adapter and the remaining 4 wires will need to be connected as follows: White - Ground to the vehicle frame. Black - Connect to battery with fuse or breaker for 12V power. Blue - Connect to Brake Controller...
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    Image 1 for
  • 4-Pole Trailer Wiring Harness Options for 2012 Ford E350 Van
    We can help you with a 4-pole flat trailer wiring harness for your 2012 Ford E-350 van. All types of wiring kits are shown on the linked page. These include products for vans equipped with no factory wiring, vans with a factory 4-pole set-up and vans with a factory 7-way. You can use the drop-down menu tool at the top of the page to Select Vehicle Style of your particular van to then see appropriate products. If the van has no type of factory-installed trailer wiring you can use the plug-in...
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  • Trailer Wiring Recommendations to Install Brake Controller on 2007 Ford E250 without Factory Wiring
    The Curt Custom Fit Vehicle Wiring # C56020 that you referenced does not include the wiring to activate trailer brakes. In order to activate the trailer brakes you will need to install the # C56020 and a Brake Controller Installation Kit # ETBC7. This kit comes with everything you would need to install a brake controller which will activate the trailer brakes. I attached some helpful links for you to check out also.
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  • Parts Needed to Add a Trailer Brake Controller to a 2011 Ford E-350
    The power used by a trailer wiring harness like # 118551 only powers the trailer lights and will not have any affect on a brake controller or the 7-Way nor will either of those items affect the 118551. Since the 4-Way only has the lighting functions, when you hardwire the 7-Way you will need to run additional wires for the remaining functions. I have included a link to our wiring FAQ article with diagrams of various trailer connectors that you can use when hardwiring in the 7-Way. I...
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  • Can Curt 4-Way T-Connector Be Secured Near 2012 Ford Van Hitch Receiver
    There sure is a way to route the Curt T-Connector Vehicle Wiring Harness # C56020 on your 2012 Ford Van so that it stays installed next to your hitch receiver. I'm attaching an installation video of this wiring kit on a 2013 Ford Van that you can follow to accomplish this. I also recommend picking up the mounting brackets # 18144 and # 18140 to secure the 4-Way next to your hitch receiver.
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  • 4-Pole Wiring Harness for 2007 Ford E-450 Shuttle Van Without Factory Tow Package
    For 4-pole trailer wiring for your 2007 Ford E450 van without the factory tow package you can use Curt custom-fit passive harness # C56020 or the Hopkins custom harness # HM11140495 which has a powered converter. Both are shown on the linked page. The differences between the two are that the Hopkins kit requires an additional wiring step for installation and that it offers a much higher 8-amp output current rating. This harness will also protect the van's internal wiring from any shorts...
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  • Brake Controller Does Not Power Up on a 2006 Ford E-450 Van
    Just to be sure, the Hopkins harness that you should be using for the 2006 Ford E-series van is # HM47715. Make sure that the factory fuse for the brake controller is installed. Use the van owner's manual to find the fuse and relay locations for the tow package wiring. I checked the owners manual online and it looks like there are 2 brake controller fuses. Inside the in-cab panel there is one in location 39. Under the hood there is one in location 10. If you have it all hooked up right...
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  • Hitch Recommendation for a 2006 Ford E350 Cutaway
    For a rear mounted hitch for your 2006 Ford E350 I would recommend the Curt Hitch part # 14055. I attached an install video for you to check out to the right. For trailer wiring you would want the part # C56020. For ball mounts I recommend the etrailer Ball Mount Kit # 989900. It comes with 2 ball mounts, 2 balls, a hitch pin with clip, and a carrying bag. If you were looking for a front mounted hitch instead you would want the part # 33055.
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  • Recommended 6-Way Trailer Wiring Connection Compatible With 2006 Ford E-350 Econo Van
    The Replacement Multi-Tow 6-Way and 4-Way Trailer Connector # 40965 will work on your 2006 Ford E350 Econo Van if you have the factory 7-way trailer connector. If you do not have that factory 7-way, then you would need the # ETBC6 to get your 6-way trailer connection by utilizing a current 4-way. If you don't have a 4-way, then I recommend starting with the Curt # C56020 which is a confirmed fit to your factory wiring located behind your tail lights. I've attached a few videos to assist.
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  • Parts Needed to Install Brake Controller and 7-Way in 2004 Ford E-350
    You will need to start with a 4-way (if you do not have one). For that you would want the # C56020. From there you would need to convert the 4-way to a 7-way so that you can install the brake controller. For that you will want the Brake Controller Install Kit and 7-Way Adapter part # ETBC7. I attached installation instructions and an install video for this product as well. For a brake controller I would recommend the Prodigy P2 Brake Controller part # 90885. This is our best selling brake...
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  • Which Hitch for a 2010 Ford E-350 Extended Body Econoline Van
    For your 2010 Ford E-350 with the extended body you can use the Curt Trailer Hitch Receiver - Custom Fit - Class IV - 2" # 14055, which is a confirmed fit on this vehicle. This is a Class IV hitch with a 2" receiver that has a thick, durable powder coat that will help fight rust and corrosion. If you also need a wiring harness to tow a trailer you'll want to use the # C56020, which will tee into the tail lights on your E-350 for an easy installation. This harness will provide you with...
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  • Brake Controller Recommendation for 2013 Ford E250 Cargo Van
    With Factory 7-Way means your vehicle already has a 7-Way connector at the rear of your vehicle. It sounds like your 2013 Ford E 250 Cargo Van is not equipped with a tow package, so you will need to start by installing a 4-way connector like the Curt T-Connector Vehicle Wiring Harness, # C56020. This connector plugs directly into your existing wiring with no cutting or splicing required. Next you will need a 7-way connector. The Universal Installation Kit, # ETBC7, kit includes the wiring...
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  • Recommendation for a Trailer Hitch to Fit a 2006 Ford E-350 Van
    For your 2006 Ford E-350 van, I recommend the Curt Class III Receiver Hitch, # 13055. The hitch has a 600 lbs tongue weight capacity and a 6,000 lbs towing capacity. What I like about this Curt hitch over the other brands we carry is the ease of installation. The Curt hitch will install to the frame of your Ford using already existing bolt holes. There will be no drilling required making installation less labor intensive. If you are going to use the hitch to tow trailer, then you will...
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  • Parts Needed to Install a 7-way on a 2006 Ford E-150
    The Multi-Tow 7-Way & 4 Pole Trailer Connector # 74682 that you referenced is designed as a replacement for a 2006 Ford E-150 with a tow package that has the OEM harness. You might look under the rear end of your vehicle to see if you can find the round socket. If you do not have a factory 7-way already you should not find one unfortunately. If you have no trailer wiring connectors at the rear of your vehicle I would recommend you start with a Curt T-Connector Vehicle Wiring Harness #...
    view full answer...

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