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  1. Custom Fit Vehicle Wiring
  2. CURT
  3. 4 Flat
  4. No Tow Package
  5. Trailer Hitch Wiring
  6. Vehicle End Connector
THIS ITEM IS NOT A FIT FOR
2011 Lexus LS 600h L
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CURT

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

Part Number: C55570
In Stock
$51.85
Retail:$88.95
You Save: 42%
Custom Fit Vehicle Wiring
Not Confirmed to Fit

2011 Lexus LS 600h L

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etrailer Installation
We'll connect you with nearby partnered installers who know this exact setup.
Quickly and easily install a 4-way trailer connector on your vehicle with this custom harness. T-connector plugs directly into existing wiring - no cutting, splicing or tapping required. Converter is made using SMT to ensure superior performance. 1-800-940-8924 to order CURT custom fit vehicle wiring part number C55570 or order online at etrailer.com. 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 (19)
  • Q & A (0)
  • Videos (1)
  • Photos

CURT Custom Fit Vehicle Wiring - C55570

Highlights

  • Custom Fit for Your Vehicle: Works with your vehicle's wiring
  • Tow Without Factory Prep: 4-way flat connector powers trailer lights for safe towing.
  • Plug-and-Play Install: T-connector plugs inline with tail lights—no cutting or splicing.
  • Protects Vehicle Electronics: Powered converter isolates trailer load from factory wiring.
  • Clean Factory Fit: Uses existing trim and grommets to hide wiring for a neat setup.
  • Versatile Use: Ready for adapters when converting between 4- and 7-way connectors.

Features to know about

Installs Without Cutting or Splicing: Plug-In Harness

Wiring up a trailer is usually a hassle, but this Curt T-Connector makes it simple. It’s a plug-in harness that connects right at the vehicle’s existing plugs, so there’s no need to cut or splice wires. Just plug it in and you’ve got a solid connection ready for towing.

Ready for Trailers That Use Standard Lighting: 4-Flat Connector

This harness comes with a 4-flat trailer connector that handles running lights, turn signals, and brake lights. It’s the standard setup for most small and mid-size trailers, giving you all the basics you need for safe, legal towing.

Comparison image of Curt T-Connector vehicle wiring harnesses with 4-pole flat trailer connectors showing different plug ends and wire configurations.

Built-In Protection for Vehicle Electronics: Powered Converter

A powered converter keeps the vehicle’s delicate wiring safe by drawing power directly from the battery instead of the tail light circuit. It helps prevent overloads and makes sure your trailer lights work reliably every time you plug in.

Clean, Straightforward Install: Designed for Vehicles Without a Tow Package

For vehicles that didn’t come with a factory tow package, this harness fills the gap perfectly. It’s made to integrate neatly with the existing wiring and trim, giving you a tidy setup without extra drilling or loose wires hanging around.

Specs

Electrical

  • Connector type: 4-pole flat
  • Converter type: Powered converter
  • Compatibility: Vehicle end connector
  • System type: Plug-in, plug and lead
  • Application: No tow package

55570 CURT T-Connector - Surface Mount Technology - 4 Wire

Installation Details C55570 Installation instructions

This Product Fits The Following Vehicles




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

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




Video Transcript for Curt Custom Fit Vehicle Wiring - Trailer Hitch Wiring - C55570 Review

Today we're going to review part number C55570. This is the CURT T connector vehicle wiring harness with the four way flat trailer connector. Now, this is a custom fit part. It is designed to fit the 2004 to 2009 Nissan Quest vehicle. On a custom made part I'd always reccommend to go to our website, use our fit guide, put in your year and model vehicle, it'll show you if this will work for your application. So this harness will provide this four way flat trailer connector at the back of your vehicle to power your trailer signal lights. It does connect very quickly and easily, there's no cutting or splicing the wires. Basically you just locate your connection points which are in the rear cargo area, plug in your T connectors on both sides, and then plug the wire ...

This black power wire plugs into a mating connector that's next to the tail light wiring harness on the driver's side . And then you have this last white wire with the eyelet on it that should give the connector a good clean ground. Once that's all connected run your bonded wire out the back with the four way on it and it'll will plug in and provide power to your trailer signal lights. This harness does include this tail light converter and this is to ensure that your vehicle's wiring match that of your trailer. This converter is constructed using AMT technology which is surface mount technology. This will give you consistent, reliable performance, even maximizes your trailer light yield and intensity, and produces minimal heat. Also gives you superior operation in any rough road conditions. Also comes with this nice dust cap for your four way.

So, all you have to do is just install this onto the plug itself. You can leave it on if you'd like . Just like that. When you're not plugged into your trailer put your cap over your terminals and it'll protect from any damage, arcing, or elements. A few specs on this harness, the maximum amperage for the stop and turn light circuits is three amps per circuit. For the tail light circuit it's seven point eight five amps total. It does come with a nice set of detailed instructions that will tell you how to install it, and then it even gives you pictures showing you where the connection points are. It does come with everything shown here.

I'm going to show you in a minute how these all will connect when you install it. So basically what you want to do is go to the rear of your vehicle, into the rear cargo area and get access behind the tail lights. What you want to do is start on the driver's side and take the key connector harness that has the yellow wire in it . That's for the driver's side . Go ahead and unplug the harness from the tail lights, this will plug in behind that. And then we had mentioned also on the driver's side you have this single black wire with the connector on it, there will be a connector that will match this on the driver's side also.

You'll plug this in so you get the power. You'll see this longer length of green wire, this is for the passenger's side. Run this over to the passenger's side same way behind the tail light, unplug it, plug this in line into it. Then your last wire is this white wire with the eyelet on it. This is for your ground, what you'll want to do is find a good clean ground. If you need to make one they do include a grounding screw that you can drill a hole, put your screw in and ground it to get your good clean ground. Then your converter you want to attach to a nice flat surface so it doesn't bounce around. They do give you double sided tape to put on it to attach it down, and also some longer cable ties to adhere it down also if you need to, and then some shorter cable ties if you need to take up any slack in the wiring. There is one last thing, you need to install this ten amp fuse into your fuse box at the front of the vehicle. There'll be a location if you look in your owner's manual. Also in your instructions it'll tell you where to put this fuse in the correct location. But that should do it for the review on part number C55570. This is the CURT T connector vehicle wiring harness with the four way flat trailer connector. .

Ratings & Reviews

4.8

19 reviews
5 Stars
(15)
4 Stars
(4)
3 Stars
(0)
2 Stars
(0)
1 Star
(0)
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by:
Sometimes the signal won't flash when the trailer lights are hooked up. Sometimes it does fine...
Nick S. profile picture
Etrailer Expert

Nick S.

12/22/2025

Typically the most common issue when lights are sometimes working and sometimes not is either a bad ground connection, or loose connection with the tail lights. I would recommend re-grounding the harness somewhere new and double checking all your connections, or the side that has the issue.

by:
Trailer wiring Installation instructions are right on, clearly showing in detail my vehicles items to be removed to accomplish installation. Highly recommend this company for their customer service, timely shipping, keeping me informed on shipping status and quality products at an affordable price.
by:
Very happy with this custom made wiring harness. l just plug in the T connector and play and not like other that required to cut wiring. 20 min installation.
by:
2009 Nissan Quest
I ordered a hitch and wiring harness for my 2009 Nissan Quest. The product and pricing were excellent. The equipment shipped promptly and arrived a few days later. Customer service was also great. When I was installing the hitch, it didn't quite fit. I thought maybe I had received the wrong part, but after a quick call to customer service, I realized what was wrong and was able to complete the installation. Thanks to Ashley. Highly recommend eTrailer
by:
2008 Nissan Quest
The trailer wirng system was exactly as described and I was surprised how fast it arrived having choosen only the standard shipping. I plan on installing it myself and using it for boat trailer lighting.
by:
Fast shipping. Good product but missing ground screw. The instruction states to use the ground screw from one of the cable harness but my car does not have one.
Luckily I was able to locate one and secured it to the car chassis. Would have been nice if the cables attaching to the black box are modular or detachable so the routing would have been easier.
by:
Nissan Quest
Wiring harness for our Nissan Quest was easy to follow and fit. Worked firstvtime no issues.
by:
Awesome service, Awesome Hitch, fit great, all good here. !
by:
2010 Dodge Caravan
Works just fine. Will order from the company again.
Dennis M. profile picture

Dennis M.

8/27/2021

Just fine.

by:
So easy to use. plug in the connection and you are done. I ran the wire to the outside of our vehicle to make everything fit a little better.
by:
2007 Nissan Quest
Bought for our 2007 Nissan Quest. Still working great after using for a year!
by:
no issues installing
by:
Works great. No problems
by:
2004 Nissan Quest
Part was perfect and easy to install just like you said it would be. Thanks for a great product
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See what our Experts say about this CURT Custom Fit Vehicle Wiring


Info for this part was:

Employee Leah B
Edited by:
Leah B
Employee Lindsey S
Written by:
Lindsey S
Employee Jeff D
Installed by:
Jeff D
Employee Wilson B
Updated by:
Wilson B
Employee Kristina F
Updated by:
Kristina F
Employee Isabelle B
Updated by:
Isabelle B

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