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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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Custom Fit Vehicle Wiring

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Custom Fit Vehicle Wiring C56327 - Custom Fit - Curt
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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. Call 800-298-8924 to order Curt custom fit vehicle wiring part number C56327 or order online at etrailer.com. 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.
  • All Info
  • Reviews (21)
  • Q & A (12)
  • Photos
  • Why etrailer?

Curt Custom Fit Vehicle Wiring - C56327

  • Custom Fit
  • Trailer Hitch Wiring
  • Curt
  • 4 Flat
  • Powered Converter

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:  4.8 out of 5 stars   (20 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.

- C56327

works great. 695396

- C56327
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. 615325

- C56327

Installed easily. Worked great for my ford transit 893988

- C56327

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. 880375

- C56327

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 869929

- C56327
2020 Ford Transit T350

Would be better if it could somehow link into factory tow system without hooking into the tail lights. Otherwise works great! 867752

- C56327

Ordering was easy. E Trailer processed order quickly. UPS delivery was on time. Easy to install.... My wife did it thanks to your great how to video. 862061

- C56327

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. 844287

- C56327

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. 809553

- C56327

Installation went well. Followed suggested video. 809008

- C56327
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. 774917

- C56327
2018 Ford Transit T250

Install went pretty good. Power wire was short, I just spliced a little more on. 724953

- C56327

Excellent product, everything you need to make the connections, make sure to watch one of the provided videos, the videos are different, depending on your van. 697286

- C56327

This wire harness was so easy to install any one can do it. Fast shipping with tracking. Satisfied customer!!! 643529

- C56327
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. 639902

- C56327

Great products , and GREAT customer service. I made one call and thought I was going to be on hold and be transferred to no where , NOT THE CASE. These people know their product and it shows ! 5 stars 637216

- C56327

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. 602142

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


- C56327
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. 573472

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.
-- Mike L - 10/11/2018


- C56327

well packaged 470540

- C56327

Curt hitches and acessories are all top flight, as is the service received from etrailer. 462605


Ask the Experts about this Curt Custom Fit Vehicle Wiring

  • 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...
  • 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...
    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 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...
    view full answer...
  • 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...
  • 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...
  • 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...
    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...
    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....
    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...
    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...
    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...

Do you have a question about this Custom Fit Vehicle Wiring?

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Info for this part was:

Edited by:
Lindsey S
Expert Research:
Jameson C
Video Edited:
Dustin K
Video Edited:
Chris R
Installed by:
Cole B
Updated by:
Sarah W
Updated by:
Kristina F
Updated by:
Isabelle B
Written by:
Amanda M
Test Fit:
David F

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