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Metra 70-7304

Wiring Harness for Select 2010-Up Kia & Hyundai Vehicles

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Metra Audio Store

When replacing your factory radio with an after-market car stereo, the Metra 70-7304 wire harness is a must for a quick and clean installation. It eliminates cutting your OE radio plug. After connecting it, your install is simple as the wires will color-match and easily connect to the after-market stereo. Without the Metra 70-7304, you would have to cut the OE radio plug and manually test each wire to connect to your after-market receiver. In addition, because you do not have to cut your OE radio plug off, the Metra 70-7304 allows you to reinstall your factory receiver if necessary. A great example is if you sold your car, but wanted to keep your after-market radio and re-install your factory stereo receiver. We also recommend the Scosche BOBAZT for a quick connection that is sure to last.

Product Features:

  • Harness is used when installing an aftermarket stereo
  • Connects the aftermarket stereo harness to the vehicles factory harness
  • Designed specifically to fit the compatible vehicles
  • Plugs into the factory harness without cutting any wires
  • Standard color coded wires provide a consistent and simplified installation
  • Made from OEM quality materials
  • Compatible with Select 2010-Up Kia and Hyundai vehicles

Compatibility List:

  • Kia:
    • 2010-Up
  • Hyundai:
    • 2010-Up


  • Yellow – 12V Constant
  • Red – 12V Accessory
  • Black - Ground
  • Orange – Dash Light Dimmer/Illumination
  • Green – Left Rear Speaker (+)
  • Green with Black Stripe Left Rear Speaker (-)
  • White – Left Front Speaker (+)
  • White with Black Stripe – Left Front Speaker (-)
  • Purple – Right Rear Speaker (+)
  • Purple with Black Stripe – Right Rear Speaker (-)
  • Gray – Right Front Speaker (+)
  • Gray with Black Stripe – Right Front Speaker (-)

Harness Features

Vehicle Sound System
This refers to what kind of sound system the vehicle has. Premium audio systems are generally name brand systems (such as JBL, Bose, Rockford Fosgate, etc) that have been installed inside a vehicle when it leaves the factory. Often they more advanced systems, complex wiring, factory amplifiers, and other features that can make installing aftermarket component difficult.
Standard Sound
Main Harness Function
Different installations on different vehicles require different harnesses. This type is what the harness is considered. Each wiring harness we sell serves a purpose such as installing an aftermarket car stereo, integrating an aftermarket amplifier with your factory car stereo, connecting Bluetooth to your factory car stereo, and more.
Connect/Install an Aftermarket Car Stereo
Compatible Vehicle Make
Allows you to view only items that are compatible with your vehicle's make. Does not guarantee that it will work with your vehicle year or model.
Compatible Vehicle Make and Model
The model of vehicle that this vehicle specific product is designed for. Please keep in mind that engine variations can affect the compatibility of the products.
Hyundai Accent
Hyundai Santa Fe
Kia Optima
Kia Sorento

Warranty and Return Policy

Parts Warranty Duration
1 year
Labor Warranty Duration
1 year
Warranty Provider

Summary of Customer Ratings & Reviews

Rating Distribution

5 Star
4 Star
3 Star
2 Star
1 Star

Average Attribution Rating


Rochester, MN

Metra 70-7034 wiring harness used in 2014 Kia Optima- VERY happy

January 25, 2014

This wiring harness worked very well with a 2014 Kia Optima. I was disappointed with the Metra website for the wiring diagram. I had to re-write it so I could understand it. The speaker wires portion of the harness was very easy- color matching. Connecting up the Axxess remote control had some questionable wire colors that slowed the installation process. Definitely would purchase this item again (it was included in the purchase price of my Kenwood DDX770).
What is a wiring harness? The deck has a plug-in with pigtail wires. This wiring harness is spliced to those pigtails and plugs into your vehicle's harness for the factory sound system. NO cutting of factory wires. Deck-Splice- harness connection- factory harness connection

21 of 25 found this helpful

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Verified Purchase
Great Value & Quality

May 9, 2015

Delivered product as advertised of great value & quality. Will shop again for sure with them

6 of 9 found this helpful

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Tampa, FL

Good Company, Good product

April 18, 2016

Does what it claims. Snaps right in after wiring up, makes it simple and easy.

0 of 0 found this helpful

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Browse 2 questions and 9 answers
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Why did you choose this?
Sonic Electronix Store
Fit the car
Thomas F on Sep 10, 2015
goes with the car to retain steering wheel controls
jason m on Aug 31, 2014
Needed for my car to hook up professianlly
Brandon P on Jan 31, 2015
Matches Car and stereo.
David B on Jul 30, 2014
Does this allow your steering wheel controls to work?
A shopper on Jul 10, 2015
Best Answer: No, not by itself. I am assuming you are installing an aftermarket head unit. You will still need a steering wheel adapter.
Reply · Report · Dennis T on Jul 12, 2015
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Sonic Electronix Wiring Guide

Wiring Diagram Legend

Warning: The image depicted shows the resistance change when wiring multiple subwoofer terminals. Please refer to your subwoofer's owner's manual for the proper wiring of its terminals. Sonic Electronix, Inc. is not responsible for damage caused to your audio system or vehicle due to improper installation. Please call tech support at 1-877-289-7664 if you require additional assistance.

Product Name: Metra 70-7304