---
product_id: 3818830
title: "CURT 56040 4-Pin Wiring for Subaru Ascent, Forester, Outback, Crosstrek"
brand: "curt"
price: "$87.65"
currency: USD
in_stock: true
reviews_count: 13
category: "Curt"
url: https://www.desertcart.us/products/3818830-curt-56040-4-pin-wiring-for-subaru-ascent-forester-outback
store_origin: US
region: United States of America
---

# SMT circuitry durability 4-pin OEM plug-in No cutting or splicing CURT 56040 4-Pin Wiring for Subaru Ascent, Forester, Outback, Crosstrek

**Brand:** curt
**Price:** $87.65
**Availability:** ✅ In Stock

## Summary

> 🔗 Hook up your Subaru trailer wiring in a snap—no splicing, no stress!

## Quick Answers

- **What is this?** CURT 56040 4-Pin Wiring for Subaru Ascent, Forester, Outback, Crosstrek by curt
- **How much does it cost?** $87.65 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/3818830-curt-56040-4-pin-wiring-for-subaru-ascent-forester-outback)

## 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

- • **Stress-Free Towing:** Seamless vehicle-to-trailer compatibility for your next adventure
- • **Tailored for Subaru:** Custom-fit for Ascent, Forester, Outback & Crosstrek models
- • **Complete Kit Included:** All hardware plus dust cover for clean, secure connections
- • **Durable SMT Circuitry:** Advanced tech ensures long-lasting, reliable performance
- • **Plug & Play Simplicity:** Instant 4-way flat socket with zero wiring hassle

## Overview

The CURT 56040 is a custom-fit 4-pin wiring harness designed specifically for Subaru Ascent, Forester, Outback, and Crosstrek models. Featuring a plug-and-play design with OEM-compatible connectors, it eliminates the need for cutting or splicing. Built with durable SMT circuitry and including all necessary hardware plus a dust cover, it ensures reliable, hassle-free trailer light connections for safer towing.

## 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: Perfect fit and easy install 2026 Forester. - Worked perfect on my 2026 Subaru Forester. For this type of wiring and a newer vehicle, be sure to check with manufacturer as well as desertcart for compatibility. I found that desertcart did not know that this wiring would work for my new car. Their options were far more expensive and required wire splicing and running dedicated power. Only issue I had when installing was that one of the clips went flying when I pulled it. For the other clips I just put a rag over it when pulling. I did find my wayward clip half way down the driveway.
Review: Great quality and very easy to install - High quality, quick & easy to install, great quality for the price. Highly recommend

## Features

- Plugs into existing OEM vehicle socket to provide a 4-way flat socket
- Simple plug-and-play design eliminates the need for cutting or splicing
- 4-way flat output connects tail lights, brake lights and turn signals
- Equipped with tail light converter for vehicle-trailer compatibility
- Constructed with SMT circuitry for better performance and durability

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0031G8GME |
| Best Sellers Rank | #20,063 in Automotive ( See Top 100 in Automotive ) #50 in Towing Hitch Wiring |
| Brand | CURT |
| Brand Name | CURT |
| Cable Type | Flat Ribbon |
| Connector Type | 4-Way Flat |
| Customer Reviews | 4.8 out of 5 stars 3,773 Reviews |
| Global Trade Identification Number | 00612314560400 |
| Included Components | Custom Wiring |
| Item Dimensions | 4 x 2 x 9 inches |
| Item Type Name | Subaru Ascent, Forester, Outback, Crosstrek, XV |
| Item Weight | 12 ounces |
| Item dimensions L x W x H | 4 x 2 x 9 inches |
| Manufacturer | Curt Manufacturing |
| Material | Plastic |
| Material Type | Plastic |
| Model | 56040 |
| Number of Items | 1 |
| Part Number | 56040 |
| UPC | 612314560400 |
| Unit Count | 1 Count |
| Warranty Description | 1 Year Limited Manufacturer Warranty |

## Product Details

- **Brand:** CURT
- **Item Weight:** 0.75 Pounds
- **Item dimensions L x W x H:** 4 x 2 x 9 inches
- **Manufacturer:** Curt Manufacturing
- **Material:** Rubber

## Images

![CURT 56040 4-Pin Wiring for Subaru Ascent, Forester, Outback, Crosstrek - Image 1](https://m.media-amazon.com/images/I/715aJ6m2uqL.jpg)
![CURT 56040 4-Pin Wiring for Subaru Ascent, Forester, Outback, Crosstrek - Image 2](https://m.media-amazon.com/images/I/81kzaEVPagL.jpg)
![CURT 56040 4-Pin Wiring for Subaru Ascent, Forester, Outback, Crosstrek - Image 3](https://m.media-amazon.com/images/I/A10wck2XOqL.jpg)
![CURT 56040 4-Pin Wiring for Subaru Ascent, Forester, Outback, Crosstrek - Image 4](https://m.media-amazon.com/images/I/918qO0g05BL.jpg)
![CURT 56040 4-Pin Wiring for Subaru Ascent, Forester, Outback, Crosstrek - Image 5](https://m.media-amazon.com/images/I/61KMYxigWNL.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

### ⭐⭐⭐⭐⭐ Perfect fit and easy install 2026 Forester.
*by O***O on July 14, 2026*

Worked perfect on my 2026 Subaru Forester. For this type of wiring and a newer vehicle, be sure to check with manufacturer as well as Amazon for compatibility. I found that Amazon did not know that this wiring would work for my new car. Their options were far more expensive and required wire splicing and running dedicated power. Only issue I had when installing was that one of the clips went flying when I pulled it. For the other clips I just put a rag over it when pulling. I did find my wayward clip half way down the driveway.

### ⭐⭐⭐⭐⭐ Great quality and very easy to install
*by M***T on May 21, 2026*

High quality, quick & easy to install, great quality for the price. Highly recommend

### ⭐⭐⭐⭐⭐ Easy install with very minor modification.
*by K***S on June 28, 2026*

Very easy. Installed on my 2026 Forester. The only fiddly part was getting the factory pig tail out from the back left corner. It is taped back on the the harness. I used a linoleum knife to reach in and cut the tape. From there you can pull it out and remove the tape. I replaced the terminal ring on the ground wire with the larger ring supplied in the kit and then was able to use the bolt holding the metal bracket that supports the carpeted floor panel. I put the controller in the center below the hatch catch, reinstalled the styrofoam cubby and coiled the trailer wire in that ready to feed through the bottom of the hatch when needed. Make sure the rubber weather stripping goes back over the plastic sill when reinstalling.

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*Product available on Desertcart United States of America*
*Store origin: US*
*Last updated: 2026-08-25*