# CURT 56321 4-Pin Trailer Wiring Harness for Select Kia Sportage

The CURT 56321 vehicle-side trailer wiring harness is listed for select Kia Sportage models. It plugs into the tail light assembly and provides a 4-way flat connection for trailer tail lights, brake lights and turn signals, without cutting or splicing, according to the listing.

- [Original product page](https://best-deals.pro/product/curt-56321-kia-sportage-4-pin-trailer-wiring-harness)
- [View offer](https://best-deals.pro/visit/curt-56321-kia-sportage-4-pin-trailer-wiring-harness)
- Market: US
- Language: en-US
- Currency: USD
- Brand: CURT
- Model: 56321
- Category: Cars & Motorcycles > Vehicle Accessories
- Price: 76.00 USD
- Previous price: 89.55 USD
- Discount: 15%
- Price checked: 2026-11-14T05:46:52.678Z
- Rating: 4.6 / 5
- Reviews: 310

Prices and deal status are the latest recorded data, not a guarantee of availability. Confirm the price and availability with the store.

## At a glance

- The harness plugs into the vehicle tail light assembly to provide a 4-way flat socket.
- The listing describes a plug-and-play installation that avoids cutting or splicing.
- The output is intended for trailer tail lights, brake lights and turn signals.
- A tail light converter is included in the described harness design.
- SMT circuitry is claimed by the manufacturer, which says it is designed to handle towing vibration.

## Pros

- Vehicle-specific harness design can simplify connecting trailer lighting on compatible Sportage models.
- Four-way flat output covers the listed tail, brake and turn signal circuits.
- No cutting or splicing is required according to the product description.

## Specifications

### Identity and connection
- Brand: CURT
- Model: 56321
- Connector type: 4-Way Flat
### Dimensions and installation
- Dimensions listed: 14.38 x 3.5 x 3.25 inches
- Weight listed: 1.7 pounds
### Materials and protection
- Material listed: Plastic

## Before you buy

- The listing says this fits select Kia Sportage models but does not identify the applicable model years here. Confirm fitment for the vehicle's year, make, model and style before purchase. The product description says a dust cover is included, while the explicit included-components field lists only custom wiring, so whether the cover is in this package is unconfirmed.

## In the box

- Custom wiring (Included)
- Dust cover (Check selected pack): Mentioned in the product description, but absent from the explicit included-components list. Confirm package contents.

## A good fit for

- Kia Sportage owners whose vehicle is confirmed compatible and who need a 4-way flat trailer-light connection.
- Buyers seeking a vehicle-tail-light plug-in harness intended to avoid cutting or splicing.

## Less suited to

- Buyers who need a confirmed fit for a particular Sportage year without checking application details.
- Towing setups that require a connector other than 4-way flat.

## Customer feedback

Customer feedback highlights easy installation, clear instructions, functional operation and a good fit. One customer reportedly took about two hours to install it, so plug-and-play does not necessarily mean a quick job. The generally favorable rating distribution is encouraging but does not establish fit for a particular Sportage year. Verify vehicle compatibility before relying on the fit reports.
- Positive themes: Customers report easy installation and clear instructions.
- Positive themes: Feedback describes the harness as working well and fitting properly.

## Frequently asked questions

### Does the CURT 56321 fit every Kia Sportage?
The listing says it fits select Kia Sportage models and does not specify model years in the supplied details. Confirm application compatibility for your vehicle before ordering.
### What lights does the 4-way flat output connect?
The listing describes connections for trailer tail lights, brake lights and turn signals.
### Does installation require cutting or splicing?
The product description says the plug-and-play design connects at the vehicle tail light assembly without cutting or splicing.
### Is a dust cover included?
The product description says a dust cover is included, but the explicit included-components entry lists only custom wiring. Confirm whether the cover is in the selected package.

## Alternative options

- [CURT 13485 Class 3 Trailer Hitch for Hyundai Tucson and Kia Sportage \| Fits 2022 to 2026 Tucson and 2023 to 2026 Sportage, 2" Receiver, 3,500 lb GTW, 525 lb TW, Concealed Main Body, No Drilling](https://best-deals.pro/visit/curt-56321-kia-sportage-4-pin-trailer-wiring-harness)
- [CURT 56474 Vehicle-Side Custom 4-Pin Trailer Wiring Harness, 4-Way Flat, Fits Kia Sorento 2021-2024 with LED Taillights, Kia Sportage 2023-2025, Battery Connection Required](https://best-deals.pro/visit/curt-56321-kia-sportage-4-pin-trailer-wiring-harness)
- [4-Pin Trailer Wiring Harness Compatible with Kia Sportage 2017-2022 56321](https://best-deals.pro/visit/curt-56321-kia-sportage-4-pin-trailer-wiring-harness)
- [CURT 55529 Vehicle-Side Custom 4-Pin Trailer Wiring Harness for Select Kia Sportage](https://best-deals.pro/visit/curt-56321-kia-sportage-4-pin-trailer-wiring-harness)
- [4-Pin Trailer Wiring Harness Compatible with 2023-2025 Kia Sportage 56474 \| Trailer Hitch Wiring Harness Replacement for 2021-2024 Kia Sorento with LED Taillights](https://best-deals.pro/visit/curt-56321-kia-sportage-4-pin-trailer-wiring-harness)
- [PEMICEM 4-Pin Trailer Wiring Harness Compatible with 56474 Kia Sportage \| Towing Hitch Wiring for Trailer Light cable Connect Replaces for Kia Sorento with LED Taillights 2021-2024](https://best-deals.pro/visit/curt-56321-kia-sportage-4-pin-trailer-wiring-harness)
- [4-Pin Trailer Wiring Harness Compatible with Kia Sorento LX S 2021-2025 Replacement...](https://best-deals.pro/visit/curt-56321-kia-sportage-4-pin-trailer-wiring-harness)
- [4-Pin Trailer Wiring Harness Compatible with 56420 Hyundai Santa Fe \| Replacement f...](https://best-deals.pro/visit/curt-56321-kia-sportage-4-pin-trailer-wiring-harness)
- [4-Pin Trailer Wiring Harness Compatible with Kia Sorento 2021-2024 56530 \| Trailer ...](https://best-deals.pro/visit/curt-56321-kia-sportage-4-pin-trailer-wiring-harness)
- [4 Way Trailer Wiring Harness 56420 Fits for Hyundai 2019-2023 Santa Fe, 2022-2024 S...](https://best-deals.pro/visit/curt-56321-kia-sportage-4-pin-trailer-wiring-harness)
- [Custom 4-Pin Trailer Wiring Harness Compatible with Kia Telluride 2023-2025 Excludi...](https://best-deals.pro/visit/curt-56321-kia-sportage-4-pin-trailer-wiring-harness)
- [Dasbecan 56474 Trailer Wiring Harness Compatible with Kia Sorento 2022 \| Fits Sportage 2022-2023, Vehicle Side 4-Way Flat Trailer Connector Plug, Trailer Hitch Wiring Harness Kit](https://best-deals.pro/visit/curt-56321-kia-sportage-4-pin-trailer-wiring-harness)

## Add-ons

- [CURT 13281 Class 3 Trailer Hitch, 2-Inch Receiver for Kia Sportage \| Fits 2017-2022 Kia Sportage, 3,500 lb GTW/525 lb TW, No drill installation, Concealed main body, Verify vehicle tow limits](https://best-deals.pro/visit/curt-56321-kia-sportage-4-pin-trailer-wiring-harness)
- [CURT 58300 Vehicle-Side Trailer Wiring Harness Mounting Bracket for 4-Way Flat, GLOSS BLACK POWDER COAT](https://best-deals.pro/visit/curt-56321-kia-sportage-4-pin-trailer-wiring-harness)

## Images

![CURT 56321 4-Pin Trailer Wiring Harness for Select Kia Sportage — 1](https://best-deals.pro/i/lQO0xB_tD42Dn8sqwM3mXLuey7TXV7I5oPP3zVAvV-jjjGylCUUwVZET1c9jljzy6qh572_Tyzi6NMGjCVFIyAZwRbLY8c1q4Ja_yBCJc_DX6XLwxLZgEUj6.jpg)

![CURT 56321 4-Pin Trailer Wiring Harness for Select Kia Sportage — 2](https://best-deals.pro/i/zzsmtqoUnSGW317VAghhf7-VL7an0Zj7zb9MQOuJYRVnNypJj4tu8MlTskoqFGiRuZnuhnC963J76U-ffQdGUbMjmZIrviteXhlw4bIBFiX06d5GvulB0cXR.jpg)

![CURT 56321 4-Pin Trailer Wiring Harness for Select Kia Sportage — 3](https://best-deals.pro/i/W2DI8c1zjGj1Mikp7thba1zpY_bOv7l7P9eJo_PoatSiIneHcH09caoqSouwH6DAnFHxfCkyjqkyhUQTtGWC0TFMont6HLVPMkyjbxObF6loye0V5l3h3Uj7.jpg)

![CURT 56321 4-Pin Trailer Wiring Harness for Select Kia Sportage — 4](https://best-deals.pro/i/aFfv9-t7cGsKdAhnpxPUxpuNSpgACzdCBQ2QBRobwj7hsNXMYZtdZ4PWAK9cVtpAYeeKkTEeK-FS90WVSSEylLkGjubF7z0f11eLAweREzDcPi-4O28zDhcT.jpg)

![CURT 56321 4-Pin Trailer Wiring Harness for Select Kia Sportage — 5](https://best-deals.pro/i/7nM9xOkHhHEHyIas8NmBQs927bm_Gm8IkcFsvxx9VKbCOyrIubVDl6LcqbfrjytXwaXRvshDmYrY8C3uVTnolc5XW-OkZfEoEiv0Lw0ORJbkHsii93VK0YNa.jpg)

![CURT 56321 4-Pin Trailer Wiring Harness for Select Kia Sportage — 6](https://best-deals.pro/i/B06_l4-1pEahzZi8E7jvpLEvCnS7F5WXFu9eWuOaOVkwWy-4d1UoWM-Z080ZfIkfVZZHxpes0sXHMwdN8jYV1U9CslXEjUVFNgFmsJqp3bmYGh7_R494kJJw.jpg)

![CURT 56321 4-Pin Trailer Wiring Harness for Select Kia Sportage — 7](https://best-deals.pro/i/w51xIJo2XNWbnUVn4pNgDmbF4pgQQ7oLV0K9g7BceFIg-m_ebEtWK_IED-r11luq0ulfu_6RODpOmx6GyzuTj9iZ4VaxSnJJxsq_fA9Lc9qR9mMrUx279png.jpg)