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

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Product guide

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.

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.

Price

$76.00Save 15%

Reference price: ~~$89.55~~

Price checked: Nov 14, 2026

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Pros and cons

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.

Technical specifications

6 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

What to know before buying

Listing details to confirm

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.

What’s in the box

Custom wiringIncluded
Dust coverCheck selected pack

Check which accessories are included in your selected pack before buying.

Who is it for?

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.

CURT 56321 4-Pin Trailer Wiring Harness for Select Kia Sportage · photo 2 — Additional product photo 2

Customer reviews on Amazon

4.6 / 5 · 310 ratings

5 stars75%75%
4 stars14%14%
3 stars6%6%
2 stars3%3%
1 star2%2%

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.
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.