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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 # C56327
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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. Powered converter reduces strain on wiring system and is made using SMT to ensure superior performance. 1-800-940-8924 to order CURT custom fit vehicle wiring part number C56327 or order online at Free expert support on all CURT products. Guaranteed Lowest Price 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 (64)
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  • Why etrailer?

CURT Custom Fit Vehicle Wiring - C56327

  • Custom Fit
  • Trailer Hitch Wiring
  • 4 Flat
  • Powered 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. Powered converter reduces strain on wiring system and is made using SMT to ensure superior performance.


  • 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
    • Locate connection points behind tail lights
    • Plug in T-connector
    • Run hot lead to car battery
  • Includes powered tail light converter that connects directly to battery to avoid overloading vehicle's electrical system
  • Constructed using surface-mount technology (SMT) for consistent, reliable performance
    • Maximizes trailer light yield and intensity while producing minimal heat
    • Ensures superior operation in rough road conditions
  • Comes with dust cap for 4-way flat connector


  • Maximum amperage:
    • Stop/turn lights: 3.0 amps per circuit
    • Tail lights: 6.0 amps per circuit
  • Limited 1-year warranty


This custom-fit T-connector plugs into your vehicle's wiring harness, which is located in your rear cargo area, behind the driver's-side and passenger's-side tail lights. You will have to remove the rear scuff panel to access these connection points. Once you've plugged in the T-connector, run the hot lead up to your car battery. Connect the lead to the included fuse holder, and then connect the fuse holder to the positive terminal on your battery.

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.

Powered Tail Light Converter with Surface-Mount Technology

A tail light converter is built into this T-connector. This converter is a circuit-protected, battery-powered unit that bypasses the electrical routes that are used by a basic wiring harness. As a result, there is virtually no draw on your tail light circuits.

Curt builds each tail light converter using surface-mount technology (SMT). This method of construction involves soldering electronic components directly to the surface of a printed circuit board. SMT eliminates the need for leads, which are used in older through-hole technology. The result is a circuit board that is smaller yet provides more routing area and that offers superior performance, reliability and durability.

Curt SMT Circuit Boards

Circuit boards constructed using SMT have been shown to perform better under rough conditions with excessive vibration than those made using the through-hole method. And where would vibration be more likely to occur than in towing applications? Curt converters also produce less heat, leading to increased durability and longer life. In addition, lower levels of resistance ensure better performance, especially for parts that operate at higher frequencies.

Each Curt circuit board is made using high-quality components that are pieced together in the most technologically savvy fashion, leading to greater predictability and reliability in functioning.

56327 CURT T-Connector - Surface Mount Technology - 4 Wire

Replaces Curt C56249

Installation Details C56327 Installation instructions

This Product Fits The Following Vehicles

California residents: click here

Customer Reviews

Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector - C56327

Average Customer Rating:  4.7 out of 5 stars   (64 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. Powered converter reduces strain on wiring system and is made using SMT to ensure superior performance.


I ordered a hitch and wiring for our church van.

I give this company a 5 + for your product.

The hitch was easy to put on but the wiring took a little longer but
I was able to get it on the van.

I would recommend this company for other products that they offer.

2021 Ford Transit T350

I was able to install it, but there were some serious hurdles. The cables were too short for the transit 350HD crew. I had to extend both the black wire that goes to the battery as well as the green one that goes to the other light. The most time I spent on identifying the problem with one wire that was loose in the socket.
I was able to resolve the problems and it works now as desired.

It is possible that depending on how the wires are routed that additional wiring may be needed. I recommend taking a look at the video install that we did on a 2106 Ford Transit T350. And the FAQ on routing the power wire under the vehicle.
-- Etrailer Expert Jenny N - 03/09/2022

2020 Ford Transit T350

Liked the kit but found a better way to install without cutting grommets. Mounted below drivers side tail light. See pics. Power wire was run all the way to the fuse box under hood instead of battery under drivers seat. This kept all wiring outside keeping all grommet seals intact, and saving time on removal of interior panels which are difficult with 15 passenger seating still installed.


The only issue I had to deal with was mounting the harness box. I eventually gave up and used a wire tie to mount to existing hole. 44° may have been the issue with the double stick tape?
Other than my vehicle's panels and battery under driver's seat, the install went well.

Ford Transit Connect

the connections were supposed to be for ford transit t350, they were not the same as on the vehicle. i was going to splice in the wires but have not gotten around to it.

As long as your 2015 Ford Transit T350 has single rear wheels the Curt T-Connector Vehicle Wiring Harness Part # C56327 will not require splicing and will connect to the factory connectors.
-- Etrailer Expert Thomas M - 12/30/2021

2017 Ford Transit T150

This is an easy to install kit, and the install video made it even simpler. I chose to mount my wiring on the left doorpost, where it can easily be pulled out through the rear door weatherstripping when needed. I was able to keep all wiring inside the van compartment and frame rails. Two hopefully helpful comments:
* In order to mount to the door rail, it is necessary to splice in a couple of feet of wire to the green wire between the two light buckets. By cutting this wire, I was able to snake it through the frame tubing under floor behind the rear door latch. I did not have any wiring outside the vehicle.
* There is a wiring lug available on the side of the driver's seat, adjacent to the battery compartment, which may be a more convenient lug to attach the hot wire to. The video shows running the wire all the way to the engine compartment.
Best of luck.


Really like this item. The kit is complete with everything needed to do an average (read: mediocre) installation based on the etrailer videos.
In order to do a truly exceptional, professional installation there needs to be some changes to the wiring a bit.

I mounted the control box on the 'inside' of the D pillar right behind and above the rubber grommet that houses the OEM lead for the left rear tail light. The location shown in the videos is unacceptable. Since my mounting location inside the pillar is higher, that caused the wiring to be short for the right side which required another 18 inches of wire spliced in. Also, since the D Pillar on the Transit is Boron hardened, it's almost impossible to drill through which required locating the ground to another location below which could be drilled with the self tapping screw.

The real fun begins when its time to run the 12 volt power lead to the battery.
The video shows the basics on the proximity to run the wires and where to mount the Ring connector to the lug next to the fuse box under the hood.
What the video didn't show was the huge PIA it is to route the wire keeping it away from heat sources and anything that might cause abrasive forces to the wire over time. The video showed the van up on a lift where the installer could have 'easy' access to all of those little nooks and crannies, and probably with some help from a second person.
Try doing all of that while the vehicle is not on a lift, where you have to raise the vehicle for access so you can get underneath to run this one wire.
I used a good amount of plastic loom where needed, but was able to eventually able to get the wire to the 12 volt source per the instructions.

Please don't take this as a complaint. I knew what I was getting into before ordering this kit.
It's just that the videos are a bit misleading in terms of the time requirements. It takes a whole lot more time than they say, and it's not really 'easy' per se... it is more of a challenge.

The hardest part for me was to fight the urge to forego my principles of maintaining excellence, for mediocrity just to avoid the hassles of doing the job the right way as opposed to taking the easy way out...

Regardless, I'm still giving this item 5 stars. It's truly a great kit for the money. Just do the job the right way from the beginning and you won't have issues later on.


Our previously installed harness quit working. Something got fried inside the converter. The part we ordered from etrailer was literally a snap to install and works exactly as it should. So my trailer lights are back in business! The price was right, shipping time was acceptable and it took me about an hour to remove the old harness and install the new.

Regarding installation on a Ford Transit: I've seen several comments about the difficulty of making connection to the battery, which is under the drivers seat. Our van has a remote positive terminal in the engine bay to make jump starting easier. Our original harness was wired to this terminal, so I just kept the wiring in place.

Still working as advertised. No issues at all.
Mark M - 02/03/2020


The unit stopped working the left turn signal. it will be constantly on when I connect the trailer plug.

Thank you for your review! If you havent already, sometimes checking wiring connections and making sure the ground wire has a clean, direct contact point can solve these sorts of issues. I hope this helps!
-- Etrailer Expert Brooke M - 08/20/2021


The kit comes with everything you will need to wire for a trailer plug. The only thing I needed to modify was the green wire for the RH turn/brake signal. It is a little short. The connectors were of good quality and it is a simple install. You will need to remove the driver's seat to access the battery for the 12V power wire unless you are making your connection under the hood

Ford Edge

Very well assembled kit. I used the e trailer install video and followed it step by step. Although very informative the video and printed directions did not address Transit 150s with finished interiors. Unable to route my power cord along the wall I zip tied it underneath then ran the line to a 1/4" hole I drilled under the seat between the base and wheelwell upper edge. Completely hidden and a straight route to the battery under the seat. Total time about 1 1/2 hours.

Were glad to hear the install worked well for you. Youll want to make sure that you use a grommet or some silicone caulk to protect the wire where it passes through the vehicle firewall, the metal edge can abrade the wire over time and cause the copper conductor to short out on the metal.
-- Etrailer Expert Mike L - 10/11/2018

2015 Ford Transit Connect

I bought this thing so that I could put a trailer hitch on my 2015 Ford transit 150 work vehicle. Because the transit is a real POS it wasn’t easy. But the instructions were comprehensive and the installation went as well as could be expected. The product worked flawlessly and has worked for over a year now. From a trailer wiring standpoint this is not a bad deal. Shipping was as promised, I had no reason to talk to the people about a customer service issue. It got four stars instead of five because I had to install it on the stupid transit van. I hit my head twice under the truck and I carry a grudge. I know this isn’t etrailers fault but somebody has to pay.


Very good!

2020 Ford Transit T150

The etrailer trailer hitch I purchased looks like excellent quality, and was shipped quickly. Thanks etrailer!


Had Uhaul do it originally and everything they did failed including brake controller.
Replaced all their junk and every thing I did still works perfectly.
Simple install process and strongly recommend if your trailer has old style bulbs.
If you don't use this device with bulbs you will fry you BCM. LEDs seem to work. Ford is ignorant to it so if your van lights stop working, tell them replace the BCM, no need for their diagnosis.


Curt hitches and acessories are all top flight, as is the service received from etrailer.


Excellent arrived right away.


The harness and wiring was easy to install with normal tools. Fit was adequate with a little fiddling. After a year there is little sign of weather induced degradation of any of the wiring. I like the fact that the plug comes with a snap on weather protector. Since I tow only 6 or 7 times a year I have no idea how durable the plug will be.


I received the Hitch for my Ford T350 Van and it was really east to install, great instructions. It came in a Well packed box and in pristine condition.
It was easy to install and I did the job myself with little problem.
I haven't done the wiring yet but I am assume it will be a no brainer as well
Good service, great product


The instructions and connectors were helpful. The parts seemed to be of good quality. It could use longer wires leading to the tail lights. I cut the four pin off and wired it to a 7 pole rv socket.

2018 Ford Transit T350

Always had good luck with Curt products; Worked as advertised, instructions
were clear and accurate. Plugs into factory sockets with no problems.
Would buy again and again.

2015 Ford Transit T250

Excellent delivery time and product is as expected.


have not install yet. Tow hitch and wir ing


Super easy install. Great price

2018 Ford Transit T250

Install went pretty good. Power wire was short, I just spliced a little more on.

Show More Reviews

Ask the Experts about this CURT Custom Fit Vehicle Wiring

  • Does Install of Trailer Wiring on Vehicle Drain Battery
    It would be incredibly out-of-the-ordinary for a trailer wiring harness like the Curt # C56327 you installed to cause a dead battery on a vehicle. Most likely what happened is that when you installed it last night you had the doors/hatch open which was running the interior lights for an extended period of time which then drained the battery. And it wasn't until this morning that you tried to start the vehicle this morning that you noticed the dead battery.
    view full answer...
  • 4-Way Trailer Connector Not Getting Power On 2016 Ford Transit T150
    If you have a vehicle wiring harness like the Curt T-Connector Vehicle Wiring Harness 4-Way Trailer Connector # C56327 you will have a power wire that is run to the battery on your 2016 Ford Transit T150. Make sure to check that the in line fuse which should be located by the battery is not blown and feeding power to your 4-way connector. I recommend testing the 4-Way connector with a Circuit Tester like the Draw-Tite Circuit Tester # 40376. If the power wire and fuse are ok, check for...
    view full answer...
  • Which Trailer Wiring Harness from Curt was Designed for 2017 Ford Transit T250
    Curt has a custom fit trailer wiring kit that fits your 2017 Ford Transit T250 with the part # C56327 which installs easily by plugging in line with the taillight connectors but they don't have the # C56190 listed as a fit for your vehicle so we don't have specific install instructions we can recommend that have been tested. Since your vehicle has combined trailer wiring the red wire being grounded is the correct approach but you might check the connections of the other wires as well.
    view full answer...
  • 4-Flat Wiring Harness for 2016 Ford Transit T250
    The Curt T-Connector Vehicle Wiring Harness # C56327 will not have anything to do with charging batteries. It simply gives your 2016 Ford Transit T250 a 4-flat harness to power your trailer's lights. To charge your camper's batteries you can simply use a 12V battery charger, the CTEK MULTI US 7002 12-Volt Universal Battery Charger with Pulse Maintenance and Backup Power # CTEK56353.
    view full answer...
  • Troubleshooting Overloaded Vehicle Harness On a 2015 Ford Transit T250
    That sounds correct to me. When you cut off the Curt T-Connector Vehicle Wiring Harness # C56327 converter box, it tried to pull all the power for the trailer circuits off the vehicle harness on your 2015 Ford Transit T250. It hopefully only damaged the fuses and not parts of the vehicle harness. Be sure to check the power wire that ran to the converter and see if the fuse was damaged or any of the harness is damaged as that would explain why it was not working when you recently tried to...
    view full answer...
  • Complete Towing Setup For A 2022 Ford Transit T150
    For your 2022 Ford Transit T150, we have the Curt Trailer Hitch Receiver # C13193. This is a class IV trailer hitch that is confirmed to fit your Transit T150, and, has a maximum towing capacity of 6,000-lbs, and a maximum tongue weight of 900-lbs You'll need to refer to your owner's manual also, and compare your vehicles maximum towing capacity to the maximum towing capacity of the hitch, and use the lower rating between the two. To complete your towing setup, you'll need wiring # C56327...
    view full answer...
  • Brake Controller and Wiring Recommendation for a 2015 Ford Transit T250
    You will need to start with a 4-way (if you do not have one). For that you would want the # C56327. 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...
    view full answer...
  • Trailer Wiring and Trailer Hitch that Fits 2020 Ford Transit T350HD with Dually Wheels
    The etrailer hitch part # e98842 does fit your 2020 Ford Transit T350HD as we've had customers with this exact setup let us know that it fit well. Then for trailer wiring the Curt # C56327 that you referenced is a confirmed fit and would work well too.
    view full answer...
  • Troubleshooting Trailer Wiring on a 2015 Ford Transit T350
    I can help you troubleshoot your wiring issue. You are correct when you say that you will need the power converter that is used by the Curt harness # C56249 you referenced. This will have a 12 volt wire run to the battery and will allow all your trailers functions to work properly. The converter will draw the power from your vehicles battery instead of the taillights which sounds like is the issue you're having. Yes, the wiring adapter # C56327 can be used on the 7-way if you cut off...
    view full answer...
  • Parts Needed to Install 5-Way on 1995 GMC 1500
    For your 1995 GMC 1500 you can install a 4-way easily on the truck with the part # C56327 which then would only need a 5-way adapter like part # C57187 and you'd be set to tow your boat trailer that has a 5-way.
    view full answer...
  • Differences in Towing Capacities for Curt Hitches for 2016 Ford Transit T350
    Both the Curt hitches you mentioned are a confirmed fit for your 2016 Ford Transit T350. The capacities are interesting but the Class IV # C14012 does have higher trailer towing capacities at 8,000 lbs vs. the Class III # C13193 which has a 6,000 lb capacity. You are correct though that the tongue weight capacity of the III is higher at 900 lbs vs. the IV which has a 800 lb capacity. The hitches have very different constructions which would be why they have different capacities. They are...
    view full answer...
  • Trailer Hitch Recommendation for Ford Transit T150 T250 T350
    The Curt hitch part # C13193 that you referenced has been confirmed as a fit for the Ford Transit vans T150, T250, and T350. These are the models of the Transit vans that look similar to the Sprinter vans. 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 a 3/4 inch rise or 2 inch drop and one with a 2-3/4 inch rise or 4 inch drop. It also includes a 1-7/8 inch ball, 2 inch ball, hitch pin with clip, and a...
    view full answer...
  • Curt T-Connector or T-One Wiring Harness on 2017 Ford Transit T350?
    Both the Curt T-Connector # C56327 and the T-One # 118643 are great wiring harnesses with very similar features and functions. Both are 4-pole flat trailer connectors with their own technology to minimize the draw on your tail lights and make the best and safest connection. The main difference between the two is current output. The Curt harness can deliver a full 3-amps per stop/turn circuit and 6-amps for the tail lights. The T-One harness' output is 2.1-amps and 3.75-amps maximum. While...
    view full answer...
  • Does Installing Curt Class III Hitch C13193 on 2018 Ford Transit 150 Interfere w/ Spare Tire
    Although the spare tire should be lowered to allow access during the install process, it is replaced right back in the same potion after the install is complete. As you can see in the photo I've provided, the hitch doesn't interfere with the spare tire in the slightest. This will fit your Transit 150 as long as it's not considered a cab/chassis or a cutaway model. For an easy installation, use a M12 x 1.75 thread tap to cut threads into the sleeves in the frame that receive the mounting...
    view full answer...
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  • What Parts do I Need to Install a Brake Controller on My 2022 Ford Transit T250?
    In order to install a brake controller on your 2022 Ford Transit, you need a 4-way harness installed first. For that part, I recommend the Tekonsha T-One Vehicle Harness # 118643. The Tekonsha harness comes with a higher-quality converter box than the Curt # C56327. Once the 4-way is installed, you are able to install the 7-way harness. For this harness, I recommend the Universal Installation Kit for Trailer Brake Controllers - 7-Way # ETBC7. With this harness, you will be able to splice...
    view full answer...
  • Brake Controller Recommendation for a 2015 Ford Transit 250
    We don't carry Ford brake controllers, but we do carry aftermarket brake controllers that will work well in your 2015 Ford Transit 250. I spoke with my contact at our brake controller manufacturer and he was unaware of there being a brake controller port on your vehicle so he said the vehicle would have to be hardwired for a brake controller. First you will need to start with a 4-way if you do not have one. For that you will need part # C56327. From there you would need to convert the...
    view full answer...
  • 4-Pole Wiring Harness Kits for 2016 Ford Transit T250 & T150
    The two 4-pole wiring harness kits you referenced, Curt # C56327 and Tekonsha # 118643, are confirmed fits on both the 2016 Ford Transit T150 and T250 if they do not have the factory trailer wiring setup. Installation for these two harnesses is essentially identical. Both have custom-fit connectors that plug in at your taillight wiring; both have a white ground wire that will attach to the vehicle metalwork; and both have a single power wire that you will need to run up to the engine compartment...
    view full answer...

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Info for this part was:

Employee Lindsey S
Edited by:
Lindsey S
Employee Jameson C
Expert Research:
Jameson C
Employee Jacob T
Video Edited:
Jacob T
Employee Dustin K
Video Edited:
Dustin K
Employee Chris R
Video Edited:
Chris R
Employee Cole B
Installed by:
Cole B
Employee Wilson B
Updated by:
Wilson B
Employee Kristina F
Updated by:
Kristina F
Employee Isabelle B
Updated by:
Isabelle B
Employee Amanda M
Written by:
Amanda M
Employee Jonathan Y
Video by:
Jonathan Y
Employee Conner L
Test Fit:
Conner L
Employee David F
Test Fit:
David F

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