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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 # C56319
Our Price: $61.40
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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. Powered converter reduces strain on wiring system and is made using SMT to ensure superior performance. 1-833-496-1390 to order CURT custom fit vehicle wiring part number C56319 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 (18)
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  • Videos (3)
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  • Why etrailer?

CURT Custom Fit Vehicle Wiring - C56319

  • 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 in rear cargo area
    • Plug in T-connector
    • Run hot lead to car battery
  • Includes a powered tail light converter that connects directly to your battery to avoid overloading your 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: 7.5 amps per circuit
    • Tail lights: 7.5 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. You will have to remove the trunk floor coverings and the rear scuff panel 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 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.

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.

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.

56319 Curt T-Connector Vehicle Wiring Harness with 4 Pole Trailer Connector

Installation Details C56319 Installation instructions

This Product Fits The Following Vehicles

California residents: click here

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

Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.

Video Transcript for Curt T-Connector Vehicle Wiring Harness - 2018 Chevrolet Cruze

Rob: Hey everybody. It's Rob here at And today we're going to be taking a look at the CURT T-connector Vehicle Wiring Harness on our 2018 Chevrolet Cruze. Now here's what our wiring harness is going to look like once we have it installed, it is going to provide us with a 4-pole flat trailer connector. So whenever we are pulling a trailer, we have all the required lights to get down the road safely.Like our turn signals, our stop lights and our tail lights. Now a 4-pole connector is going to be one of the most common connectors on trailers, especially with some smaller utility trailers and boat trailers.

But our wiring harness is compatible with adapters in case your trailer has a larger, maybe a six, 7-way connector on it. It's definitely adaptable. So you can use it with those connectors as well. You just need an adapter that is sold separately.Now our wiring does come with a dust cap, which keep all that dirt and debris out of it. But you also notice that our wiring is actually coming out of our trunk and that's because whenever we're not using it, the wiring harness is actually going store inside of our trunk.

Typically, a good spot to keep it is underneath this panel down by your spare tire. That way, whenever you do need it, you can grab the bundle of wire. We can drape it out the back. As long as we stay away from the latch mechanism, the weatherstripping here provides plenty of cushion where the wire not going to get damaged or anything like that.And it's really nice to have it on the inside, especially if you don't tow a whole lot, because then the elements aren't going to beginning to our wiring, we're not going to have to worry about the sun damaging the insulation or the rain getting to the connectors causing corrosion buildup. It'll be nice and protected inside of our car.

And again, whenever we do need it, we can just drop it out the back hatch, stay away from the latch mechanism, close it up and we're ready to hook up.Now fortunately for us on our Cruze, the installation is actually really straightforward. We're just going to have a T-connector that's going to go in line between each one of our tail lights and accessing the wiring is really easy too. Everything is going to take place inside the trunk. So we'll just remove these panels, get back there and make our connections. But the nice thing also is that our CURT wiring harness is powered.

So it's not going to be taking too much power away or overloading our Cruze's tail light circuits, because it's going to have its own power wire that's going to go directly to the battery.And again on our Cruze, our battery's in the trunk. So it's really easy to access. We're not going to have to worry about running a wire into the engine bay. The CURT T-connector harness is also going to have a converter box to take the working signal from our Cruze and turn it into a trailer signal for our connector. But the converter box is also going to help protect our wiring. In case there's a problem on your trailer, it's going to prevent it from backfeeding and causing any kind of electrical issues.Now, some customers do you want to mount their wiring to the outside by their hitch and we have tons of brackets available. So you can mount this up, have a really clean look on the outside, but it is designed to stay on the inside. If you have enough slack in your wiring, there is a grommet underneath the threshold panel here towards the driver's side, and we should be able to sneak the wire out. But I think there's more benefit to keeping the wire on the inside so it's protected and out of the elements.But now that you've seen what it looks like and gone over some of the features, let's show you how to get it installed so you're going to have the confidence to do it at home. To begin our installation, we want to open up our trunk and we're going to remove all the floor coverings. So there'll be a big panel that's covering the spare tire. We'll pull that out, set it aside. Then also underneath that panel, we're going to have these foam panels. We're going to pull these out and set these aside as well.Now, the very back of the trunk opening, right where the threshold is, we want to follow that panel till we get to the bottom so we can grab the bottom of the panel and we want to lift straight up. There should be some clips. Once you get it broke loose, you kind of want to just grab the edge, start working your way across till we get all those clips release and pull the panel out. And again, we'll set this aside.Now, that we come over to the passenger side, right as you come to that fill panel with the carpeting, we'll have a push pin down here at the lower corner. And then also one closer to the tail light on the upper corner. We're going to pull those push pins out. Easiest ways to get yourself a flat blade screwdriver or a trim panel tool. We just want to pry those out. You kind of have to work at them a little bit, they have these little tabs to kind of hold pressure to keep them in. So let's pry those out. Pull the bottom one out. We want to pull the liner back. Just kind of push it out of the way for now we're going to be exposing the connector right here.So we don't need to push it too far, but you want a little bit of room to work with. Since we're on the passenger side, we want to grab our wiring harness and we're going to be looking for the T-connector that has the green wire on it. So we can come to our factory connector. We'll press down on this tab and we'll pull the connector apart and you'll notice that our new harness is going to match up. So we just want to plug the male into the female and the female into the male.That way it'll come from our light, go through a harness and back out to the tail lights. If you come down on the wiring harness a little bit, you'll find a white wire with a ring terminal on it. This is going to be our ground. Now they do provide you with a self-tapping screw so you can screw it into the body. But I would prefer not to put any more holes than we have to. So we have a stud with a nut right next to our tail light plug. So I'm going to use that. We'll just use a 10 millimeter socket to remove the nut.We'll take our ring terminal, slide it over the stud. And we just simply reinstall that nut and tighten it back up. Now we want to find the T-connector that has the yellow wire on it. This is going to connect over on the driver's side the same way. So you just want to run our wire along the back of the threshold here. That way it will not interfere with anything else inside and it'll be protected once we put our threshold back in place. But if we come over to the driver's side panel, we're still going to have that lower push pin. But instead of having a push pin up here, we have this tie down hook and there's a bolt on the bottom that we're going to have to remove to pull this panel out.And to pull that tie down hook out on the bolt, we use a seven millimeter socket. Once you have those removed, you simply just fold the panel out of the way, just like the other side. We'll take our yellow connector, bring it over and plug it in over here. So now if we come back to the passenger side where our converter box is, we should still have one more wire coming off of it and it's going to be the black wire. And this'll be our power wire. So this needs to run up to the battery. Now, fortunately for us, our battery is just a little bit forward in the trunk, but this wire is not long enough. So we'll get one of the butt connectors out of our kit, slide it over to the stripped end and we'll crimp it in place.We can grab the length of wire out of our kit. Now this is more than enough wire, but like I said, this isn't going to reach the battery so we can just leave all that excess on there until we know exactly how much we need, but we'll strip back the end of the length of wire. Then we can crimp it into that butt connector. Give it a quick tug, make sure it's secure. And we want to find a spot in this area that we can mount our converter box.Now there's a couple different ways we can do it. We can use some zip ties and wrap it around, find something to zip tied to or we can use the double-sided sticky tape and stick it directly to a panel back here so it won't be in the way. I'm just going to pull the backing off of one side of the tape, stick it directly to the converter box, press on there so it has a good, solid connection. We'll remove the other side of the backing.Now, really you want to find the flattest spot you can so the tape has enough surface area to stick to. So I think I'm actually going to go right behind this panel on the backside that way our fill panel will go back in and we don't have to worry about it interfering. So we'll just come to the backside of this panel, we're just going to stick it directly on there and kind of press to make sure it sticks good.Now we want to take some of this excess black wire and I'm going to run it along the inside of this panel and then kind of poke it out towards the back of the battery there so we can make our connections. There's no reason why we need to have it in this area so we can hide as much of the wire to keep it protected. And then again, just kind of jump over to the battery area. Tuck the panel out of the way, start feeding our wire back towards the back.Once you have your wire towards the battery, again, we really don't need all this wire. So I'm going to go ahead and trim the excess off. I do like to give myself a little bit of slack. We'll trim the excess off and we want to strip back the end of the wire. Grab another butt connector from our kit, slide it over and crimp it down. We're going to grab the fuse holder out of our kit. And this is already pre-stripped, we just have to pull the insulation off the ends. We'll take the free end, put it into the butt connector and crimp it down.With the other end of our fuse holder, we're going to grab the ring terminal out of our kit, slide it over and crimp it in place. You kind of want to just route your wire towards the positive post of the battery, which should be towards the driver's side. We can grab a 10 millimeter socket. I'm going to pull the bolt out right on top here. You do want to be mindful because there is another ring terminal attached there. So you want to make sure that goes back in place if it does come off. We'll take our ring terminal, slide it so the bolt goes through, and we simply just tighten it back down.I do want to mention when you're connecting it, you want to leave the fuse out of the fuse holder so we don't cause any shorts. Now that it is connected, we can take that 10 amp fuse, put it into the fuse holder and close up the lid. We can start working on putting all the panels back in place. You're going to push these push pins back in and it's a little bit of a snug fit, but we're just going to push them and make sure they're fully seated. It's all there really is to it.And again, I am going to tie up my yellow wire here to some of these panels before I put my threshold back in. That way I know it's not going to interfere and it'll be nice and protected behind it. We can finally put our floor covering back in place. You just want to make sure you leave that 4-pole wire accessible, have it come out the panel on the side here, because then whenever we're not using it, we can store it in the trunk.But the last step is going to be testing our wiring to make sure all the circuits work properly. So I'm going to grab a tester, hook it up and verify all the lights do work. So if I turn on my headlights, we can see that my tail light function is working. My left turn signal, my right turn signal, my brakes and my brakes and both turn signals. All we have to do now is hook up to our trailer and hit the road. But again, I'm Rob here at and that'll finish up your look at the CURT T-connector Vehicle Wiring Harness on our 2018 Chevrolet Cruze.

Customer Satisfaction Score:

Customer Reviews

Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector - C56319

Average Customer Rating:  4.6 out of 5 stars   (18 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.


After I received the right Vehicle Wiring Harness, installation was pretty easy after watching the video and following the installation instructions. I tested the lights with a 4-way flat circuit tester and everything checked out good. I plan on towing a small boat with outboard weighing under 2000 lbs.


Everything you need for a trailer hook up. Plug and play.

2019 Chevrolet Cruze

Its a pretty simple install. Watch a couple videos first. Found that the kit had the wrong plugs for my tail lights. Chev Cruz sedan and hatchback are different plugs! Customer service was excellent. Carol C helped me with the return process and ordering the right kit. Thank you!

Chevrolet Cruze

Worked great for what I was doing.
originally designed to wire trailer lights on my Cruze. I modified it to make the Cruze into a trailer to to it behind my rv. Ran the wire and connector up front under the hood to easily hook to the rv.
So much better that the magnet mount lights I used to use.

Year later. Still working.
Tom - 07/28/2020

2017 Chevrolet Cruze

Was a little bit more than I expected, my last vehicle really had just a t harness. This has a self powered and fused box that only takes signal off of the tail lights. Means if you have junk trailer wiring it is isolated from your cars wiring. Quick clean install. I’ll get another for the next vehicle.

A year or so later this thing is still working well. I haven’t blown the fuses with the trailer wire yet. Simple and clean install and the wires don’t interfere with my trunk space. I still plan to buy another of this style for my next vehicle.
Jameson K - 02/08/2020


Don’t pay for expedited shipping. Not worth the cost at all. If it doesn’t come in two days they will refund you three dollars and fourteen cents.

2017 Chevrolet Cruze

other than the two sided tape being all dried up all was easy

2017 Chevrolet Cruze

This trailer hitch was exactly as described. I was fortunate enough that I didn't have to drill any holes as this was designed to fit with existing holes in the frame of my 2017 Chevrolet Cruze. The only issue I ran into was un-hanging the muffler. The instructions showed a hanging mechanism for possibly an older model of Chevy Cruze even though other pictures in the instructions showed the correct hanger. I could not find any information online on how to remove it so I had to figure it out on my own. That took up most of the installation time.
As for towing, there were absolutely no issues. I would absolutely recommend etrailer to anyone looking for a trailer hitch and hitch accessories.

2019 Chevrolet Cruze

Second time using etrailer... both times worked great. Purchased hitch,wiring kit, ball hitch. And dust cover for my 2019 chevy cruze.. opened box and could not find the dust cover. Sent a email
And one was shipped the same day. Great service.. correct parts THE FIRST TIME. Keep it up etrailer!

2017 Chevrolet Cruze

Great product! The fact that it is fully enclosed within the car means that it doesn’t sit in the rain and snow rusting.
It works great and was super easy to install with the help of the instruction video.

2017 Chevrolet Cruze

Exactly what I wanted ! Good quality ! Price was right !


They work great


Easy to install.

2016 Chevrolet Cruze

Just received the product today. Seems to be as advertised. Very quick delivery. Very satisfied


Great packaging and on time delivery. Also great product. Easy to install.

2017 Chevrolet Cruze

Great product.

2017 Chevrolet Cruze



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

  • Installation Instructions for Curt Wiring Harness C56319 in 2017 Chevy Cruze
    Curt T-Connector 4-Pole Vehicle Wiring Harness # C56319 will install the same way in all vehicles with which it is compatible. This wiring harness works with both 2016 and 2017 Chevy Cruze model years. The installation consists of plugging in the grey connectors at the back of the car's taillight assemblies, attaching the white ground wire ring terminal to a clean metal surface and connecting the included black power wire at the battery positive terminal and at the harness's control module....
    view full answer...
  • Best Place to Install a Trailer Hitch on a 2017 Chevrolet Cruze
    In order to have the Draw-Tite Sportframe Trailer Hitch Receiver part # 24943 installed on your 2017 Chevrolet Cruze you have a few different options. You can take it to a local mechanic as most would be qualified to do so but the best place that would have the most experience would be an RV dealer with a service center. If you like, you can show the potential shop the install video/instructions I have attached for you and I'm sure they would be able to give you a definitive yes or no...
    view full answer...
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  • Correct Curt T-Connector Vehicle Wiring Harnesses for 2016 Chevrolet Cruze Limited
    There are two Curt T-Connector Vehicle Wiring Harnesses for a 2016 Chevrolet Cruze, part # C56319 or part # C56214 for limited models. The two are not interchanged and since you have a limited you will need the latter harness. The 2016 model year was a split year for the Chevrolet Cruze, the new body style is simply referred to as Chevrolet Cruze whereas the old body style is referred to as Chevrolet Cruze Limited.
    view full answer...

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Info for this part was:

Employee Lindsey S
Edited by:
Lindsey S
Employee Jacob T
Video Edited:
Jacob T
Employee Adam R
Expert Research:
Adam R
Employee Kathleen M
Video by:
Kathleen M
Employee Chris R
Video by:
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Employee Cole B
Installed by:
Cole B
Employee Chelsea B
Written by:
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Employee Randy B
Test Fit:
Randy B
Employee Robert C
Test Fit:
Robert C
Employee Wilson B
Updated by:
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