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Say goodbye to the hassle of cutting, splicing, or tapping into your vehicle's wiring. The Curt T-Connector makes adding a 4-way trailer connector to your vehicle a breeze. Simply plug it directly into the existing wiring in your vehicle's rear cargo area, and you're good to go. This plug-and-play solution means you can spend more time on the road and less time with complicated installations.
Nothing is more frustrating than dealing with corroded connectors. Luckily, the Curt T-Connector comes with a handy dust cap to keep the 4-way flat connector clean and free from moisture and debris. A small amount of grease on all electrical connections is also recommended to further prevent corrosion and ensure longevity.
Whether you have a 5-pole, 6-pole, or 7-pole trailer, this wiring harness is compatible with adapters you may already have, so there's no need for additional converters. It’s a straightforward solution that can handle different trailer configurations without extra fuss.
This wiring harness isn’t just generic—it’s custom fit for vehicles like the Chevrolet Express and GMC Savana vans, ensuring a seamless integration with the factory setup of your vehicle. It's designed to align with the factory plugs found behind the vehicle's trim panels, making it as if it was installed at the factory.
For those who need to upgrade to a 7-way connection or incorporate additional trailer features like reverse lights, this harness is the starting point. It works excellently with adapter kits such as the ETBC7 for those looking to expand their towing capabilities.
California residents: click here
Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.
Today on our 2017 Chevrolet Express Van we will be installing the Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector, part number 55540.Speaker 2: Now here's what our wiring harness looks like. We have our 4-pole flat trailer connector here. In order to give us all the required by law lighting functions that are necessary to tow a trailer. We have our T-connect here for our driver's side. This will give us our tail lights, our turn signal and our brake light. We have our ground connection here.
Which we can attach to the vehicle sheet metal with the provided self tapping screw or alternatively there's a ground bolt already inside the vehicle that we can take advantage of and not use a self tapping screw. We have an extension over here to our passenger's side to give us our passenger's side turn signal. There's no cutting, no splicing, there's plugs in line with the tail light assembly and the vehicle wiring harness on both sides. We have a couple of zip ties here to secure all the wiring inside the vehicle. Then we have this nice included dust cover here that we can use on our 4-pole flat to help keep it protected from any dirt, debris or moisture. Just slide that on over there like that.
Fold it back over it, just like that. To begin our installation, let's open up both our rear doors in our van. Now both of our connections that we'll be working with, they're right behind our tail lights on both sides of the vehicle. They're inside the vehicle so we can hop inside and make our connections from the inside. We're looking back at our driver's side right now.
Here's the connection that we're going to be using to get our T-connector into. We'll pull back on this orange tab here, once we have that out push on this black tab. That's separated. We'll grab our connector with the yellow wire. We'll plug the male in here in the female end. Once it snaps in place, pull back, make sure it's locked.
We'll take the female end and plug it into the male on the vehicle. Then we'll reinstall the orange lock tab here. Now this ground wire, we can just attach this to this existing ground bolt right here. We'll remove this 10 millimeter bolt. Slide our ground over the bolt and reinstall it. This gives us a nice solid ground connection, we won't have to worry about it. Now we'll separate our 4-pole flat wire here. Make sure we have it pulled all the way apart. There's no knots in it. We've untangled all of our wire for our passenger's side connector. We're going to connect this first and then we'll hide all the wiring going across the top of the vehicle. This way we don't have to worry about having not enough wire to our 4-pole flat here. We want to have as much slack on this on the 4-pole flat end. More than likely you won't have these brackets here holding shelving units in place on your van. We're just going to route over these. If you do have them, do the same thing. All right now that we're over to our passenger's side we'll pull out the orange tab like we did on the driver's side. Press into the black tab here, separate the connection. Female goes to male, same over here. Re-secure our lock. Just tuck these in here behind there so that they're secured up out of the way. We'll just secure our wire to this existing wiring harness just to help you keep it up out of the way. Now we grabbed some extra zip ties here and we went down on our green wire to the end of our 4-pole flat just to help bundle everything up. That way we don't have one excess wire just hanging loose in the end of it. We'll trim off all of our zip ties now. With our wiring installed we can grab it, sit it down here in our little step bumper. Make sure we're staying out of the path of our door latch here. Close our door on over it. The weatherstripping from the door will protect it. We can close our other door now. When we hook up to our trailer, we'll just take off our dust cover here, make our connection. Before we do that I'm going to make sure we test our wiring to make sure it all works properly. We'll be using a 4-pole flat trailer tester. I'll plug this on in here. Then I'll go run our lights on the inside of the vehicle. You can make sure they're working. All right, we'll start by turning our headlights on. We'll do our left turn signal, that's working. A right turn signal. We'll step on our brakes. With all of our functions verified we're ready to hook up to our trailer and hit the road. We've arrived at our destination and unhooked from our trailer. We'll just replace our dust cover here, open our doors back up. We can stow our wiring off to the side here on the driver's side. If you've got a tool box right here you can just tuck it behind there, it will keep it secure and out of the way. Now if we wanted to have our wiring outside of our vehicle at all times versus storing it on the inside, we have an option of doing that. Right behind and below our driver's side tail light, there's a grommet right here. We can push this grommet out. We pass our wiring through there. We'll just take our plug here and insert it through our hole where that grommet was. Pull our wires on down through and our dust cover too. Then we'll drop it down behind our bumper cover here. We'll just cut our grommet, just like that. Slide our wires through it and push it back onto our vehicle. Now we'll cut off the zip tie that we used to bundle up the wire when we we're storing it inside the vehicle. We're doing this because we're going to put a wire loom over it to better hide our color wires and to help protect them behind our door here. Now we'll take our wire loom and run it down our wire. All right, with our wire loom installed over the wire, we'll put some electrical tape around it in a couple locations just to keep the loom from coming off or the wires being exposed through it. Do the end up here too. Get that done we'll drop it back down behind our bumper again. We'll slide it over a gap in our hitch and bring it back on over, back to where our safety chain loop is and we'll clip it on there. That way our wiring is readily accessible when we need to hook up to our trailer. We'll also put one zip tie right here, it's the frame to hold our loom up and out of the way. Also keep it somewhat tight against the back of the vehicle. Cut off that excess zip tie right now. This gives us the alternate installation of having our wiring outside the vehicle versus installing it inside. Before we close our door on up and make sure we re-silicon up this grommet where we cut it. This will just help keep any exhaust fumes or moisture from entering our vehicle. That completes our installation of the Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector, part number 55540 on our 2017 Chevrolet Express Van.
The Curt trailer wiring harness for the 2021 GMC Savana 2500 van was perfect! It installed extremely easily, allowed me to interconnect the trailer braking system with just a couple additional wires, and worked like a charm first time! Extremely satisfied.
Plug n play as advertised! Connecting this harness couldn't be easier! Clear simple instructions do help, but it's pretty straightforward!
Plugged into existing connector and had enough wire for everything to reach. The connector side with the yellow wire went to the drivers side of my van, it didn’t specify but everything worked well
Such a slick wiring harness. And great price.
I buy and install products from etrailer over (another site) because they filter their products. This was a professional job for a client. I don’t want crap showing up at the door. I don’t want to worry about the quality. Super appreciate etrailer for keeping my projects flowing smoothly
Install was easy bolt holes lined up and wiring was all plug and play
Never any problems with the parts I get from Etrailer!
Well made but I thought the hitch would have a place to attach it. I will have to fabricate a bracket for it
The staff is very knowledgeable and pro fessional!
Gwendolyn Y.
3/26/2025
Thanks for sharing your kind words with us, Gary! We will always be here when you need to tap into our knowledge again :)
real easy to install
I got the same curt T connection again because it's so easy to use and also the bumper mount hitch .again I say it's so easy to install, i did it in less than a hour ,Love it when I use it for my Cargo trailer. Thanks E.trailier.com for your support. Also EZ cargo rails and for quick access to tie downs. Thanks Dana for the Ordering.
I purchased this over the other brand because according to the reviews I've read this came with a longer 4 pin wire. I routed through the brake light paneling to get a clean look and had plenty of wire to reach my 7 pin connector. No pigtail coming out of my rear doors. This was installed in a 2017 Chevy Express 2500 passenger van.
Easy to order
Shipped fast
Easy to install. 20 minutes and done.
Easiest I’ve ever installed, and I’ve done a few.
Wiring kit connects inside the van and yet, it appears I have some wires from the factory right down by the hitch. I may test them before I use the wiring kit.
They answer any questions that you would have. The order was only a day off from their order system. But I would say that that could have been blamed on the USPS system. I would contact etrailer for any other of my trailer/vehicle needs in a heartbeat!! Thanks again etrailer!!
Installation on 2009 Chevy Express Van - the installation of this harness couldn't have been easier (especially when you pair it with etrailer's instructional video). The only error I made was on the driver side where there are two connections that will work with this harness. BE SURE TO USE THE UPPER CONNECTION (see attached picture).
East install
good priduct
Brooke M.
11/25/2024
Sweet! Glad its doing its job :)
Fit perfect. Great instructions.
Nice product. Excellent packaging and detailed installation instructions provided.
Product arrived from etrailer and it was exactly as spec'ed. I own a conversion van and getting to the required junctions was a little bit of a pain, but that's not the product's fault. Once the appropriate interior panels were off, the wiring itself took 5 minutes and everything worked perfectly. I was lucky in that I needed to drill no holes. I used the product to help pull a rental trailer with no issues.
Andy
6/24/2015
Nothings change. Im not a heavy user of the product. It just sits in backuntil I need it. I happy with the review too. Still stands.
I ORDERED A TRAILER HITCH, BALL MOUNT, AND THE TRAILER LIGHTING AND I COULDN'T BE ANY MORE HAPPY WITH EVERYTHING. ETRAILER IS THE BEST. EVERYTHING WAS INSTALLED IN ABOUT 15 MIN. BY MYSELF. GREAT PRICES AND THE BEST SERVICE.
Harold P.
3/13/2018
Excellent
The connectors needed a little dielectric grease because they are very tight fit and hard to disconnect in a tight space. The 1 page included installation instructions are not sufficient but the videos provided by etrailer made it okay. There are multiple connectors on a Chevy van in the installation area (you need the higher pair) and some years are slightly different with connector location and orange connector lock tab that has to be pulled out first, and also the ground location whether bolt or metal screw. 2022 Chevy Express Van
Exactly the right solution for me. It was easy to install. Videos were helpful. I light up the trailer with no issues. I have no complaints about this product. Price for price, I always prefer etrailer.
Javier
6/3/2021
Very reliable. No issues. I would buy it again. I am very pleased with his product.
Unfortunately I have not installed this yet. I’m waiting for the hitch to arrive it’s on back order. I can say your tracking system is not very good. A day before it arrived your system still showed it on the other side of the U. S. But I did get it intact and in damaged. Have a great day.
Billy
3/21/2023
Lol that should have said. Intact and not damaged. Had a chance to use it lots now. Easy install works great.
I was very satisfied with the service and and follow up provided by etrailer, the product was exactly what I was expecting and the informative videos provided were superb,thank you so much from a very satisfied customer.l definitely plan to make future purchases from etrailer.
Philip
5/16/2022
It has been great,l have no complaints or regrets.
My experience with "etrailer" was better than expected. 1)_ The lady over the phone assisted me with my complete product order for my specific towing need for my 2010 Chevy Express 1500 Van. 2)_ I live in So. Cal. and I added the 7.50$ to insure the delivery in (5) working days. I received my package in (3)... So surprised and happy. 3)_ I received a follow up phone call and email confirming the delivery. The CURT hitch and wiring harness worked perfect and the directions we're spot on. To NOTE: My 1500 Chevy Express Passenger Van is hard to fit parts for but *(She/Customer Service) knew exactly what I needed and the follow up was a welcome surprise. I recommend "etrailer" highly. MA6HINE
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Gwendolyn Y.
3/21/2025
I love to hear how how smooth the install went! What are you towing?