---
product_id: 3818830
title: "CURT 56040 Vehicle-Side Custom 4-Pin Trailer Wiring Harness, Fits Select Subaru Ascent, Forester, Outback, Crosstrek, XV"
brand: "curt"
price: "€ 90.08"
currency: EUR
in_stock: true
reviews_count: 13
category: "Curt"
url: https://www.desertcart.hr/products/3818830-curt-56040-vehicle-side-custom-4-pin-trailer-wiring-harness
store_origin: HR
region: Croatia
---

# Plug-and-play 4-pin connector No cutting or splicing needed Weatherproof dust cover included CURT 56040 Vehicle-Side Custom 4-Pin Trailer Wiring Harness, Fits Select Subaru Ascent, Forester, Outback, Crosstrek, XV

**Brand:** curt
**Price:** € 90.08
**Availability:** ✅ In Stock

## Summary

> 🚗🔗 Tow Smart, Tow Stylish — Your Subaru’s Best Trailer Buddy!

## Quick Answers

- **What is this?** CURT 56040 Vehicle-Side Custom 4-Pin Trailer Wiring Harness, Fits Select Subaru Ascent, Forester, Outback, Crosstrek, XV by curt
- **How much does it cost?** € 90.08 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.hr](https://www.desertcart.hr/products/3818830-curt-56040-vehicle-side-custom-4-pin-trailer-wiring-harness)

## Best For

- curt enthusiasts

## Why This Product

- Trusted curt brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Durable & Reliable:** Surface mount technology ensures optimal light intensity and long-lasting performance.
- • **Tailored for Subaru:** Custom-fit for Ascent, Forester, Outback, Crosstrek, and XV models for perfect integration.
- • **Effortless Installation:** Plug directly into your Subaru’s factory wiring—no tools, no hassle.
- • **Weather-Resistant Protection:** Rubber dust cover guards your connection from dirt and moisture when not in use.
- • **Universal 4-Pin Compatibility:** Seamlessly powers trailer tail, brake, and turn signals with a standard 4-flat connector.

## Overview

The CURT 56040 Vehicle-Side Custom 4-Pin Trailer Wiring Harness offers a factory-compatible, plug-and-play solution for select Subaru models, enabling quick and reliable trailer light connections without cutting or splicing. Engineered with surface mount technology for durability and equipped with a protective dust cover, it ensures optimal performance and weather resistance, making towing effortless and worry-free.

## Description

CURT custom wiring connectors are the easiest way to outfit your vehicle with a CURT trailer wiring connection. They are built with some of the most advanced technology in the industry, and each one is custom-fitted to work with a specific make and model. Some automotive manufacturers install a special socket on the vehicle to be used for vehicle-to-trailer wiring. Although this special socket is not equipped on every vehicle, a CURT custom wiring connector -- also called a T-connector -- utilizes the socket for simple, stress-free installation. Rather than requiring you to cut, splice and solder into your vehicle's wiring system, the custom wiring connector uses a single OEM-compatible plug and instantly provides a standard, universal vehicle-to-trailer wiring connection, typically in the form a 4-way flat. All CURT custom wiring connectors are made vehicle-specific for the easiest possible installation and the best fit. This particular plug-in connector provides a 4-way flat socket and is designed to be a custom wiring option for certain years of the Subaru Ascent, Forester, Outback, Crosstrek and XV Crosstrek (to verify your vehicle compatibility, see application info). It comes with all necessary hardware to establish a solid connection. It also comes with a dust cover to keep the connector socket clean when not in use. To ensure long-lasting reliability, all CURT custom wiring connectors are thoroughly tested for optimal functionality. Stress is the last thing you should feel when towing a trailer -- whether you're hauling your RV to that favorite camping destination, your ATVs up to the hunting grounds or your fishing boat to the new hidden hotspot. At CURT, we think your towing equipment should add to the enjoyment of your experience, not detract from it.

Review: Great Kit but there is a trick to finding the factory wiring in an Outback. - I just got finished installing this but I assume it will hold up. I installed it in a 2016 Subaru Outback 3.6R Limited. I bought an ECO Hitch from Tork Lift Central and they sold this adapter as well. It was almost twice as expensive on their website so I bought mine here. If you are still looking for a hitch I highly recommend theirs. Much better looking than the other aftermarket options and I got a 2 inch receiver unlike the $800 plus one from the dealer. Installation isn't too bad until it is time to find the plug and make the connection. Most of the online installation videos gloss over this part. I read another review somewhere that mentioned removing the cargo tie down point behind the drivers side rear seat. The plug is basically right next to the opening. i used a flat blade screwdriver to break the tape and pull the plug out the hole. The other review also mentioned fishing the adapted wiring up from under the bottom of the trim panel and pulling it out if the hole too. Then you simply plug them in and pull the wiring back behind the trim panel. Right by where you pull the wiring out you will see a couple studs with nuts on them. I cut off the small ring terminal and attached the larger one provided in the kit. It fit perfectly over the stud so I removed the nut and attached it there. From here it is your preference what to do with the wiring. I tucked it up behind the trim panel and routed the wire under the foam panels under the floor to where the spare tire is. Another review mentioned making a short extension plug to run out from the spare tire compartment through a grommet that is located there. This way you won't risk damaging the end of the wiring kit. This will probably only be easy if you are removing the bumper to install the hitch.Hopefully this helps someone else like other reviews helped me. I recommend this kit and it seems well made. Plus they included the ring terminal I needed so I didn't even have to run to the store to buy anything else.
Review: perfect part - perfect part. there is a video for easy install. for my 2025 Subaru it took less than 5 minutes. previous Subaru models took a little longer due to where the harness plugs in. this years was very easy

## Features

- EASY TO INSTALL — No cutting No splicing This trailer wiring harness kit plugs into existing factory wiring on your vehicle and equips it with a standard, rear 4-pin trailer wiring connector for plugging in and towing a trailer
- STANDARD CONNECTOR — This plug-in 4-flat trailer wiring can be used to connect trailer tail lights, brake signal lights and turn signals. 4-way trailer light wiring is popular on a wide variety of trailers, adding versatile towing options for your vehicle
- VEHICLE-SPECIFIC — This aftermarket, vehicle-trailer wiring harness is designed for select years of the Subaru Ascent, Forester, Outback, Crosstrek and XV Crosstrek
- RELIABLE POWER — This 4-way trailer wiring harness is built with surface mount technology. This type of circuitry generates less heat, optimal light intensity and durable performance
- DUST COVER — To promote long-lasting use and weather resistance, this 4-pole trailer lighting wire harness comes with a rubber dust cover to easily fit onto the 4-way flat connector when not in use, protecting it against the outdoor elements

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0031G8GME |
| Best Sellers Rank | #16,039 in Automotive ( See Top 100 in Automotive ) #38 in Towing Hitch Wiring |
| Brand | CURT |
| Customer Reviews | 4.7 4.7 out of 5 stars (3,748) |
| Date First Available | October 10, 2007 |
| Is Discontinued By Manufacturer | No |
| Item Weight | 12 ounces |
| Item model number | 56040 |
| Manufacturer | Curt Manufacturing |
| Manufacturer Part Number | 56040 |
| Model | Custom Wiring |
| OEM Part Number | 56040 |
| Product Dimensions | 4 x 2 x 9 inches |

## Images

![CURT 56040 Vehicle-Side Custom 4-Pin Trailer Wiring Harness, Fits Select Subaru Ascent, Forester, Outback, Crosstrek, XV - Image 1](https://m.media-amazon.com/images/I/715aJ6m2uqL.jpg)

## Questions & Answers

**Q: Where is connector located in  2015 Subaru Outback ?**
A: Not sure where it is in the 2015 Outback but in my 2009 Forester it was on the drivers side underneath the foam storage inserts in the trunk.

**Q: 2003 tacoma**
A: I can only say it worked great on my 2013 Subaru outback hope that helps

**Q: wear is the plug on a 2013 outback**
A: for a '15 crosstrek it's behind the trim panel covering the back of the driver side taillight, down near the floor. Had to remove the trim panel just inside of lower weatherstripping for lift gate first; I think the instructions indicated that for an outback it's farther forward, nearer the wheelwell.

**Q: Has anyone installed this in a 2015 Subaru Impreza?**
A: I was wondering the same thing, so I pulled the trim panels out of the back of my 2015 Impreza Sport Hatchback. Based on a video of the Crosstrek install of this part, there is a small white plug under the driver's side taillight in the Crosstrek that this plugs into. The plug is non-existent in my Impreza. I checked under the passenger side too just in case, but no luck.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Great Kit but there is a trick to finding the factory wiring in an Outback.
*by 0***Y on June 23, 2017*

I just got finished installing this but I assume it will hold up. I installed it in a 2016 Subaru Outback 3.6R Limited. I bought an ECO Hitch from Tork Lift Central and they sold this adapter as well. It was almost twice as expensive on their website so I bought mine here. If you are still looking for a hitch I highly recommend theirs. Much better looking than the other aftermarket options and I got a 2 inch receiver unlike the $800 plus one from the dealer. Installation isn't too bad until it is time to find the plug and make the connection. Most of the online installation videos gloss over this part. I read another review somewhere that mentioned removing the cargo tie down point behind the drivers side rear seat. The plug is basically right next to the opening. i used a flat blade screwdriver to break the tape and pull the plug out the hole. The other review also mentioned fishing the adapted wiring up from under the bottom of the trim panel and pulling it out if the hole too. Then you simply plug them in and pull the wiring back behind the trim panel. Right by where you pull the wiring out you will see a couple studs with nuts on them. I cut off the small ring terminal and attached the larger one provided in the kit. It fit perfectly over the stud so I removed the nut and attached it there. From here it is your preference what to do with the wiring. I tucked it up behind the trim panel and routed the wire under the foam panels under the floor to where the spare tire is. Another review mentioned making a short extension plug to run out from the spare tire compartment through a grommet that is located there. This way you won't risk damaging the end of the wiring kit. This will probably only be easy if you are removing the bumper to install the hitch.Hopefully this helps someone else like other reviews helped me. I recommend this kit and it seems well made. Plus they included the ring terminal I needed so I didn't even have to run to the store to buy anything else.

### ⭐⭐⭐⭐⭐ perfect part
*by S***N on December 31, 2025*

perfect part. there is a video for easy install. for my 2025 Subaru it took less than 5 minutes. previous Subaru models took a little longer due to where the harness plugs in. this years was very easy

### ⭐⭐⭐⭐⭐ 1,2,3 and you're done!
*by R***B on September 12, 2024*

Fit the car perfectly, simple to install, saved over $100 by doing it myself v.s. having the hitch installer do it. really only takes 15-20 minutes and most of that time is removing and installing the car interior pieces that have to come out to access the in-car harness. Be sure to use a harness tester to confirm that everything is working properly, I had to disconnect and reconnect the harness connector once to ensure a solid connection, also be sure your ground is really electrically connected to the frame, some metal pieces of cars today are not electrically bonded to the frame. Everything is working as expected.

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*Product available on Desertcart Croatia*
*Store origin: HR*
*Last updated: 2026-03-10*