Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector
(86 reviews)
Price: $83.87
In Stock
Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector
Item # C56403
Retail:$154.95
Our Price: $83.87
You Save: 46%
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- All Info
- Reviews (86)
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CURT Custom Fit Vehicle Wiring - C56403
- 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.
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
- Locate connection points behind tail lights
- Plug in T-connector
- Run hot lead to car battery
- Includes a tail light converter to ensure that your vehicle's wiring matches that of your trailer
- Powered module 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
Specs:
- Maximum amperage:
- Stop/turn lights: 5 amps per circuit
- Tail lights: 7.5 amps per circuit
- Limited 1-year warranty
Installation
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 scruff panel, side trim panel, and tail light assemblies to access this harness. 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 trunk.
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.
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 the trailer. This 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.
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.
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.
56403 CURT T-Connector Vehicle Wiring Harness with 4 Pole Trailer Connector
Installation Details
This Product Fits The Following Vehicles
- 2017 - 2024 Volkswagen Tiguan
- 2018 - 2024 Volkswagen Tiguan
California residents: click here
Customer Satisfaction Score:
96% were satisfied with this product
4% of customers were not satisfied
- Product did not meet expectations
- Wrong item was ordered
- Did not fit
Customer Reviews
Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector - C56403
Average Customer Rating: 4.6 out of 5 stars (86 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.by: Kelly08/04/2023
2021 Volkswagen Tiguan
Install is do able, just takes awhile. Never even looked at the instructions. Just follow the videos. I have a 2021 Tiguan. The part of the harness with the plug needs to be longer. By the time you get the plug through the hole to get out of the hatch area. There is very little wire left to get back to the hitch. Had some issues with initial order. My order was over $99 so free shipping. Unfortunately the bracket was out of stock. Even though it said it was available. Did receive email telling me delivery would not be for 2 months. Offering me the opportunity to order a different bracket. Twice the price. Email never mentioned the harness that was in stock would not ship until the bracket came in. Lucky I called and learned about the shipping issues . Was able to cancel and reorder with a bracket that was in stock. Only slightly more expensive.
by: Mark 03/23/2024
Makes easy work of adding hitch wiring to my Tiguan
by: Dan C.02/20/2024
2019 Volkswagen Tiguan
Well packaged and shipped out right away! Beware of customs delays and duty if shopping from Canada. (neither issue has anything to do with etrailer.com)
by: Eric 06/29/2023
Made it super easy to install. Watched the online videos on Etrailer which was very helpful, can't beat it. I did run one of wires a bit differently than they did, I went inside the car under the carpet and door sills instead of under the vehicle. Always have good luck with the products I get from etrailer.
by: John 04/11/2024
Good quality parts, quick delivery
by: Rick10/08/2022
Starts out okay but always disables my right blinker and right brake light. I have to remove all the Curt hookups to get my car signals working again. Thankful that my vehicle tells me my right signal does not work once the trailer is disconnected. Got to find a safe alternative. Do not want this damaging my vehicle's electrical system.
by: David M03/16/2019
Installation is easy, but time consuming. The two grommets holding the trim covering the tail lights were destroyed during my installation, even though I used a grommet tool to try and remove them. Not really an issue as I keep an assortment of them in my garage. I also found there is a vent covering the taillight harness, so all you need is to pull it out to access the wiring. I did take the screw under the 3rd row seat release out to help get the trim out enough to run the wires through. I ran the wire to the battery up the left side, under the trim along the doors. Once in the front there is a grommet up behind the brake pedal that goes right to the engine bay behind the battery. I put a small cut in it and ran the wire through it as it is soft rubber and pretty well seals itself around the wire.
David M.
3/17/2020
Have not had any issues with the harness. Works perfectly.
by: John02/18/2022
Plug and play!!
John
2/18/2023
Product works great!! Install was smooth!!
by: Darren 10/15/2023
2022 Volkswagen Tiguan
It’s a great product but was a real challenge to run the positive wire from the back of the car to the battery.
by: Glen02/18/2023
2022 Volkswagen Tiguan
Packing could be better. Box was ripped and hitch sticking out. Touched up chipped paint on reciever with black roll bar paint
by: Jon 01/14/2020
A quality product that plugs into the vehicle wiring - no splicing needed. The only drawback is that the installation instructions do not adequately explain how to remove the interior panels in order to access the tail light assemblies. The instructions mention removal of one clip on each panel; there is a lot more to it than that! The average DIYer may not be able to remove the panels without better explanation. Better documentation and/or video would be a big help.
Jon J.
1/16/2021
I installed the trailer light kit on my 2019 Tiguan about a year ago. It works fine for the lights on my utility trailer. Rather than running the 12V power wire all the way to the front of the car, I installed a cigarette-lighter end of it and plug it into the 12V accessory plug in the cargo compartment. Works great.
by: 06/01/2021
Very well-made kit and helpful installation video.
The installation video was very clear about drilling a hole in the trunk to pass through the hot wire routed under the car but made absolutely no mention of how to route the 4-pole plug from inside the trunk to the receiver outside the car. The opening needed is 1-1/2 inches X 3/4 inches which required drilling several holes and then filing the slot.
Yaakov M.
6/2/2022
1-Year Follow Up - I have only used the hitch for one haul so far but everything works well.
by: Robert11/08/2022
The wiring harness instructions were more complicated than necessary. The video was the best for installing the wiring. All in all a simple installation. I I'm very satisfied with the product.
by: Carolyn L07/01/2023
Video made this fairly easy to install.
by: Edward 09/27/2022
The trailer hitch is good but was difficult to install with undercoating making the fit more work than anticipated.
by: Rock06/13/2023
quick and easy to install, great directions and excellent product
by: Derek09/10/2019
2019 Volkswagen Tiguan
This installation took me about 2 hours. I already had my '19 Tiguan SE 4Motion up on ramps from installing the hitch receiver. Pulling the trim back and getting inside the rear area to access the tail lights was a very tight fit. Thankfully VW has access panels that can be popped out for accessing the tail light bulbs this that helped. Once I got the drivers side and passengers side connected, which is very easy. I placed the main control box just left of center with the provided double-sided tape. I tie-wrapped everything up nice and neat. The hardest part was deciding on how to run the hot + wire up to the battery. Luckily the Tiguan has an underbody panel you can run the hot wire inside of from front to rear. I also found on the drivers side on the flat surface below the tail light there is a hole with a plastic plug in it. I used that to run the hot wire from the underbody to inside the rear cargo area to complete my install. I did not run the 4 pin connector outside the body, I'll just lay it out flat and close the hatch lid on it, as suggested in the install instructions. If I was going to be towing allot I would have ran the 4 pin outside and under but since this is only for the odd use i did not.
by: Brad12/30/2018
Have to agree with the review by Brian, this is not an easy install. Spent hours trying to remove panels without breaking them and then running wires to the connectors. Also spent about two hours removing under body panels to run the power from the battery to the back of the vehicle then reinstalling.
The harness installs easily once all of the stuff is out of the way. Seems to work well, but not sure about sending constant power to the unit all of the time, key on or off. Hope this doesn't have a low voltage use when not in operation, would hate to come back to my vehicle after two weeks in the airport parking lot and have a dead battery.
by: Jeff05/09/2023
It works - so well that I don't even think about it anymore!
by: Jim Z06/28/2021
2019 Volkswagen Tiguan
The Curt wiring harness for my 2019 Tiguan impressed me with its high quality. The connectors were all OEM quality- snapped in with no problem. Once finished installing it tested out perfectly. My only issue was the generic printed instructions included with the harness. Luckily, etrailer has a step by step installation video showing a 2018 tiguan. This made installation a snap. I highly recommend buying from etrailer, quality products and help with installation.
by: Oscar06/02/2019
Normally I do not usually write anything about the purchases I make, but this is always the excess ... today I break the rule because I'm really gratified with the purchase made to etrailer.com and to be short, what is published on the website is exactly what I received , a lot of quality, very good information for the installation, a single word would summarize everything EXCELLENT
by: Chris 08/08/2022
Harness and converter have worked perfectly since installation. The quality is excellent, and I recommend Curt brand over others.
by: Keith05/01/2022
2018 Volkswagen Tiguan
Another great etrailer.com experience! The hitch fit perfectly. The instructional video was spot on. The wiring kit was an effort to install but that's because of Volkswagen, not etrailer. Couldn't believe how quickly it was delivered! Never disappointing to use etrailer.com!
by: James 07/11/2021
2019 Volkswagen Tiguan
Instructions kind of vague on the trim removal, needs longer zip ties and a self tapping screw for the ground, watch the video before installing will help greatly, seems to be a good product
by: Chris 09/22/2022
Great delivery on time.
Good video instructions to install.
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Show More Reviews
See what our Experts say about this CURT Custom Fit Vehicle Wiring
- Why Does Power Wire for Curt Wiring Harness for 2018 VW Tiguan Require Running to Vehicle BatteryNot all vehicles can handle the additional amperage draw of the trailer taillights on the vehicle taillight circuits. Those vehicles need setup that draws power from the battery. Some vehicles have higher rated circuits that can handle this, and others need to have the power drawn straight from the battery to protect the taillight circuits. If you run the power wire for the Curt harness # C56403 you have to a different circuit you will have bypassed the circuit protection and would potentially...
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view full answer... - Trailer Wiring Harness for 2018 VW Tiguan 4 MotionThere is a wiring harness for your 2018 VW Tiguan 4 Motion, the Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # C56403. I confirmed with Curt, the manufacturer, that this harness will fit your vehicle. Installing this harness will require you to plug it into connection points in the rear cargo area and run a hot lead to your Tiguan's battery. I have added a link to the installation instructions of this harness as well as an installation video for you to check out.
view full answer... - Which Tekonsha Trailer Wiring Harness Fits 2018 Volkswagen Tiguan 4MotionFor your 2018 Volkswagen Tiguan 4Motion Canadian model the Curt kit part # C56403 is the correct fit. This installs easily by plugging inline with the taillight harnesses on your vehicle.
view full answer... - Does Wiring Harness for 2018 VW Tiguan Require Power Wire to BatteryThe Curt T-Connector Vehicle Wiring harness # C56403 that you referenced, which is confirmed to fit your 2018 VW Tiguan, does indeed require that a hot lead be run to the vehicle's battery. This is the case for the other harness that is available for your Tiguan as well. The reason for this is that the wiring system on your particular vehicle requires a powered converter to safeguard the factory wiring, decipher the signals of its multiplexed circuits, and better support the trailer lights...
view full answer... - Will this Work on my 2018 Volkswagen Tiguan SE Yes, we have confirmed that the Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector part # C56403 is a fit for your 2018 Volkswagen Tiguan. It is designed to plug in directly to your factory wiring behind both tail lights and will work out very well. It gives you a working 4-way flat trailer connector that you can use for hauling trailers or lighted cargo carriers. I've included a link to the installation video we did here at etrailer to help you along when doing...
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view full answer... - Is Installation of T-Connector Wiring the Same as T-One Wiring for a 2019 Volkswagen TiguanThe installation video and instructions for the Curt T-Connector # C56403 and Tekonsha T-One # 118811 are essentially identical. There might be slight differences but you could easily install one brand with instructions from the other brand no problem. You can definitely use the install video from the Curt (linked to this answer page) to install the Tekonsha on your 2019 Volkswagen Tiguan. If you don't already have a trailer hitch then I recommend using the Curt Trailer Hitch Receiver...
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view full answer... - Trailer Hitch and Wiring Recommendation for 2018 Tiguan with R-Line PackageYour 2018 Volkswagen Tiguan R-Line the etrailer trailer hitch part # e43ZR is a confirmed fit and will work well. For trailer wiring you'd then want the Curt kit part # C56403 which is a confirmed custom fit. This would allow you to use your hitch for towing trailers as well as give you a connection point for lights if you decide to use a cargo carrier down the road as these tend to block the factory lights. If you wanted to do some towing you might be interested in etrailer ball mount...
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view full answer... - Troubleshooting the Curt T-Connector Wiring Harness That Has Lights On All the TimeJohnathan, since there there is a signal with the lights off, then there is a problem on the vehicle side. What you're going to need to do is check to make sure that the brown wire is properly connected to the running light wire at the rear of the vehicle, and that your grounds are all good, but it sounds like you've already checked this part so I'd move onto checking the converter. To test your converter, you will need to test the wiring going in for function. If the functions are incorrect...
view full answer... - Does Curt T-Connector Vehicle Wiring for VW Tiguan 2018 have to Run Straight to BatteryWe can't stop you from using the fuse panel as the power source for install of Curt harness part # C56403 but in order for the circuit protection of the harness to totally isolate itself from the vehicle wiring to prevent a short from damaging the vehicle wiring it has to go straight to the battery.
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view full answer... - Trailer Hitch for 2021 VW Tiguan Without Weld Nuts In FrameSome of the 2021 VW Tiguan models have a different bumper set-up which means that the factory bolts and weld nuts typically used to install the hitch won't be present. Curt recently realized this problem, and began including installation hardware for vehicles that don't have the OEM bolts and weld nuts. This is explained in the linked installation instructions. We've checked our current stock of the Curt # C13381, and found they all include the alternate hardware, so you'll be good to go...
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- Do I Have to Run a Power Wire to the Battery When Installing a Wiring Harness on a 2018 VW Tiguan?No, you don't want to do that! The Curt T-Connector Vehicle Wiring Harness item # C56403 needs a dedicated power source ran directly to the battery. We get these questions all the time and while it seems like a pain especially when there's alternative options like the one you suggested. We have to recommend you follow the instructions so you don't damage your vehicle, the SMT module on the wiring harness, and your trailer's lighting functions. The Curt T-Connector Vehicle Wiring Harness...
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- Does the Battery Need Disconnected To Install Curt Trailer Wiring Harness On 2018 VW TiguanThe battery does need to be disconnected in order to install the Curt T-Connector Vehicle Wiring Harness part # C56403 on a 2018 Volkswagen Tiguan per the instructions. That said, I have installed many of these harnesses without issues and never disconnected the battery. I cannot recommend you do the same but it is possible.
view full answer... - Do I Have to Cut the Trim to Install a Hitch on a 2022 Tiguan SE R-line Black Edition?Thanks for the pictures! The EcoHitch Stealth Trailer Hitch Receiver item # 306-X7393 does not require any cutting or removal of splash guards or trim. The hitch receiver sticks out through that opening below the bumper cover on your second picture above the arrow. This hitch is custom fit to your 2022 Tiguan SE R-line Black edition and bolts in behind your bumper with included hardware. I have linked an installation video below of a different hitch item # SH49ZR being installed on a Tiguan...
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- Recommended Hitch and Wiring Harness for a 2022 Volkswagen Tiguan R-LineTo set your 2022 Volkswagen Tiguan R-Line up to tow you will need the following parts: Trailer Hitch - etrailer Hitch item # e43ZR 4-Way Wiring Harness - Curt T-Connector Vehicle Wiring Harness item # C56403 Ball Mount Kit - Curt Towing Starter Kit for 2" Hitches item # C45534 For a towing a trailer with brakes you will need the following parts in addition to the ones already mentioned: 7-Way Wiring Harness - Universal Installation Kit for Trailer Brake Controller item # ETBC7 Brake...
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Do you have a question about this Custom Fit Vehicle Wiring?
Info for this part was:
Test Fit:
Joe V
Test Fit:
Ryan G
Expert Research:
Mike L
Expert Research:
Jameson C
Edited by:
Lindsey S
Installed by:
Jeff D
Video Edited:
Joshua S
Video Edited:
Dustin K
Updated by:
Wilson B
Updated by:
Kristina F
Updated by:
Isabelle B
Written by:
Ronnie R
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Jenny N.
10/24/2022
You mentioned that the right blinker and brake light are not working when the harness is installed. It sounds like that it could be the ground. I recommend checking the ground on both the vehicle and trailer side. You will want to make sure that it is grounded to solid metal location. We have a good FAQ that can help with testing the harness that you can see below.
Helpful Links
faq-4-5-way-troubleshooting.aspx