Metra 70-7903 Receiver Wiring Harness

Connect a new car stereo in select 2001-up Mazda vehicles

Item #: 120707903

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40 Reviews

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Metra 70-7903 wiring harness

This vehicle-specific wiring harness makes connections between your new car stereo and your car's electrical system.

First, attach the color-coded wires on your Crutchfield-supplied harness to the wires from your new stereo. If you're not using a soldering iron, we recommend that you purchase some wire connectors to secure the connections. Check out our handy article on three ways to connect the wiring harness here.

Now, once this harness is connected to your new stereo, you'll be able to plug right into your car's factory radio connector. This harness saves installation time since you won't have to cut factory wires individually, and it also enables you to re-install the factory radio if needed. A detailed instruction sheet comes with the harness. Warranty: 60 days.

Please read this important note: This harness may not contain provisions for every wire needed to complete your installation, and it will not accommodate special navigation, video, or factory steering wheel control connections. You will need a special adapter if you want your factory steering wheel audio controls to work with your new stereo.


  • 12V constant power
  • 12V switched power
  • chassis ground
  • power antenna turn-on
  • illumination
  • left front speaker +/-
  • right front speaker +/-
  • left rear speaker +/-
  • right rear speaker +/-

Note: Most vehicles will require additional installation parts — please identify your vehicle if you haven’t done so. You can also call an Advisor for more information.

Metra 70-7903 Receiver Wiring Harness Reviews

Average Customer Review:

40 reviews
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Exactly what I was looking for

Written By Matthew, Pell City, AL on Monday, November 23, 2015

Crutchfield Customer Review (What's this?)

Was exactly what I was looking for, had the wiring diagram on the packaging, and helped with a clean and simple install.

Metra 70-7903 Receiver Wiring Harness

Written By The Fixer, California on Monday, November 16, 2015

Crutchfield Customer Review (What's this?)

Great product It,s dummy proof, all wires are labeled easy to follow instructions

Pros: Great product at a great price

Cons: Wish it came with butt connectors to help on installation for a more pro like install.

Metra 70-7903 Receiver Wiring Harness

Written By TJ, Indiana on Monday, November 16, 2015

Crutchfield Customer Review (What's this?)

made installation easy

Pros: easy install

Cons: would have been nice if all wires were there for steering wheel control

Steering wheel connectors

Written By HE, SanFrancisco on Friday, November 13, 2015

Crutchfield Customer Review (What's this?)

Works perfectly

Pros: Fits the wiring of my Mazda 2 just like an original manufacturer part

Cons: None

Easy install.

Written By Don, New York on Wednesday, October 28, 2015

Crutchfield Customer Review (What's this?)

Perfect fit.

Just missed being perfect

Written By W, Monroe, NY on Monday, October 19, 2015

Crutchfield Customer Review (What's this?)

With one exception, this adapter was exactly what I needed to install a new head unit in my MX5. The adapter is very well built, and allowed east integration without having to cut any wires. The miss is that two pins necessary to use the steering wheel adapter were missing. There were open holes for the pins, but the pins were not included. There were also no instructions included about what to do to correct the problem. I called Crutchfield tech support, who were great with telling me which pins to move, and how to move them. These instructions should be included with the adapter.

Pros: Ease of install

Cons: Missing pins for my installation. Instructions lacking.

Works Well

Written By Tony!R, Florida on Sunday, October 18, 2015

Crutchfield Customer Review (What's this?)

First one did not work and returned for a new one. Once I received the new one, the installation worked out well. My steering wheel controls all working fine now.

Pros: Works well.

Cons: Instructions on wiring could be better explained or illustrated...Tricky to program.

Adapter Harness

Written By MAH, Indiana on Friday, October 16, 2015

Crutchfield Customer Review (What's this?)

What can I say, it connected to my 2001 Mazda Proteges dash harness easy as pie and worked.

Pros: No problems

Cons: None


Written By Scott, henderson, nv on Monday, October 12, 2015

Crutchfield Customer Review (What's this?)

Was easy and quick. I solder the harness and had no issues

Pros: Simple

Cons: Non

Perfect fit

Written By Elio C, Minnesota on Thursday, October 08, 2015

Crutchfield Customer Review (What's this?)

Easy to install and program. Works flawlessly


Written By Jim D., California on Tuesday, September 29, 2015

Crutchfield Customer Review (What's this?)

Simple way to keep the cars wiring intact.

Pros: All wiring colors matched the Pioneer head unit wiring colors.

Cons: The ONLY con is, it would be nice if it included pins, and pigtails, for the steering wheel control adaptor inputs.

Working Harness

Written By Michael, Pennsylvania on Friday, September 25, 2015

Crutchfield Customer Review (What's this?)

My son wanted a new radio for his 2003 Mazda. I Told him I Will do it for you. Its bin a long time since I put a radio in. I mean a long time like when you had to cut the wire harness and try to match the wires. And hope all 4 speakers are working.

Pros: This item was so easy to hook up.It made me look so good to my son .Now I can order a radio for my Ford Escape.Thank you Crutchfield

Works perfectly

Written By AviT, Oregon on Thursday, September 17, 2015

Crutchfield Customer Review (What's this?)

Used this to install a new head unit in my wife's 02 Mazda Protege 5. All the colors matched the head unit wire colors, so it was really easy to figure out what wires to connect. Only way to improve this would be to pre-strip, or at least pre-score, the wire insulation.

Metra 70-7903 Receiver Wiring Harness

Written By Anonymous, Charleston, SC on Tuesday, September 15, 2015

Crutchfield Customer Review (What's this?)

Easy enough to solder connections to the aftermarket harness. Solid connection to the factory harness as well.

Awesome Product

Written By Luke P, Indiana on Thursday, September 10, 2015

Crutchfield Customer Review (What's this?)

Made radio installation a breeze.

Pros: easy installation

Cons: none

Metra Harness for MX 5

Written By MedLex, Puerto Rico on Monday, July 27, 2015

Crutchfield Customer Review (What's this?)

Quick and easy ordering and receiving of product. I had to modify it to use Bose amp and speakers, works like a dream very good fit.

Pros: Great fit

Cons: No Bose amp contact


Written By Jorge, Puerto Rico on Wednesday, July 15, 2015

Crutchfield Customer Review (What's this?)

All fit perfectly. Very good!

Pros: Easy to undernstand instructions

Cons: None

Missing two wires for steering wheel control

Written By Clint, Massachusetts on Sunday, July 12, 2015

Crutchfield Customer Review (What's this?)

Metra neglected to include the two wires used for steering wheel control. Had they been there, you could solder all splices to this harness on the workbench. But as is, you need to splice into the car harness in place. This is not an insignificant pain as there is very little slack for splicing. The whole point of a harness adapter is to circumvent any need to cut into the car wiring itself. Had Metra included those two wires, this would be a 5-star product. Without them it's 2-stars.


Written By Connor, Minnesota on Friday, July 03, 2015

Crutchfield Customer Review (What's this?)

I love this product. I chatted online and they were able to find me this to install my new radio. It was fast and easy to install with this.

Pros: Fast Easy

Cons: Nothing bad

Just what I needed

Written By Eric, Florida on Wednesday, June 24, 2015

Crutchfield Customer Review (What's this?)

Got everything I needed on Crutchfield. It all works great!

Pros: Fit perfect and even included full wire diagram for harness

Wiring Harness

Written By JohnR, Florida on Friday, June 12, 2015

Crutchfield Customer Review (What's this?)

Crutchfield provides excellent products and services. When I called for additonal help, they responded quickly and accurately.

Metra wiring harness

Written By Anonymous, Clarksville, TN on Saturday, June 06, 2015

Crutchfield Customer Review (What's this?)

Even I could do it! Straightforward, quick, and easy using provided instructions.

Metra 70-7903 Receiver Wiring Harness

Written By Anonymous, New Port Richey, FL on Friday, June 05, 2015

Crutchfield Customer Review (What's this?)

Very straight problems

Metra 70-7903 Receiver Wiring Harness

Written By Anonymous, New Mexico on Monday, June 01, 2015

Crutchfield Customer Review (What's this?)

missing pins for steering wheel controls

Beware of missing pins!

Written By Robert, California on Tuesday, May 26, 2015

Crutchfield Customer Review (What's this?)

This harness was included in Crutchfield's supposedly complete solution to add a new head unit to my 2004 Mazda3. When I went to do the install I was dismayed to learn that the harness did not have 2 pins needed to connect the steering wheel controls adapter. When I called Crutchfield they told me I needed to "hardwire" (as in hack into my factory wiring harness) the steering wheel control adapter. After I called to RMA the radio and everything else Crutchfield sent me a second wiring harness which I was able to cannibalize to the harness the pins I needed..

While I am satisfied that Crutchfield ultimately helped me solve this problem they should not have sold an incomplete solution to begin with and Metra should stop cheaping out and include the pins people need to use.

Pros: Not that difficult to remove pins from a "donor" harness to build a complete harness.

Cons: Missing pins.

no pin out for steering wheel controls

Written By Anonymous, Wisconsin on Monday, May 25, 2015

Crutchfield Customer Review (What's this?)

no pin out for steering wheel controls, other then that good product

Great but...

Written By Mike V, Simi Valley, California on Saturday, May 16, 2015

Crutchfield Customer Review (What's this?)

Provides easy hook up for basic install but was missing 2 wires to hook up the steering wheel controls.

Pros: Great quality

Cons: does not have wires to connect the OEM steering wheel control!

Close but not complete for 2009 Mazda MX5

Written By Garnetmica, Massachusetts on Tuesday, May 12, 2015

Crutchfield Customer Review (What's this?)

I had to purchase a second harness in order to get the steering wheel controls in my 2009 Mazda MX5 w/o Bose to work with my Alpine ILX-007. There are two missing pins. I purchased a second harness and had to carefully remove the pins in order to install them in the 1N and 1P locations. There were many people reporting the same issue on the Miata forums so I was lucky to have had some outside guidance.

Pros: Most of it there. The quality of the harness, wires and pins are very good.

Cons: Had to buy a second harness to add pins for steering wheel controls.

Good product

Written By Chad, Brooklyn, mi on Friday, May 08, 2015

Crutchfield Customer Review (What's this?)

Made installation a breeze.

Very Good Harness

Written By Tj, Frederick MD on Friday, April 10, 2015

Crutchfield Customer Review (What's this?)

Excellent installation kit. Fit the factory harness perfectly

Great harness!

Written By Anonymous, Maryland on Wednesday, April 08, 2015

Crutchfield Customer Review (What's this?)

This Metra harness fit seamlessly mated my new Kenwood head unit to my 2007 Mazda 3. The harness included 2 connectors (powered antenna and remote amp) that were not being used. I was able to re-pin the unused wires to other places on the harness for connecting my new PAC-SWI-RC steering wheel control which prevented me from splicing into the factory wires which I was trying to avoid at all costs. This is a great harness, I would not hesitate to buy another when the need comes.

Pros: fits perfect, extra wires (in my case)

Cons: None

Needed but pins wrong

Written By Jmk, Redmond, WA on Sunday, February 22, 2015

Crutchfield Customer Review (What's this?)

Look, you need it. On my car, 2 of the pins that connected to the Axxess box and the antenna power were incorrect. After not getting this to work and a call to Crutchfield not helping, I noticed the wire mismatch when snapping the shells together. Took a few minutes to swap pins. It all worked fine. Cost me some head angling over two evenings. :-(

Pros: You need it

Cons: You need it to be correct

It works

Written By Doober, California on Tuesday, February 10, 2015

Crutchfield Customer Review (What's this?)

It works. Hooray.

Cheaped out

Written By ChrisC, Phoenix, AZ on Friday, February 06, 2015

Crutchfield Customer Review (What's this?)

Sadly, the manufacturer cheaped out with the harness. Only about half of the wires on the stock harness are filled. This isn't necessarily a bad thing, but they didn't include the pins and wires for the steering wheel radio controls!

So I had to move the amp connections over to the steering wheel radio pins (because I don't have an amp and had the non-bose radio). It was a pain pushing the pins out and then plugging them into the correct spots. Another $0.25 of wires and pins would have made this so much easier.

I have a 2008 Mazda Miata, non-Bose radio and steering wheel radio controls.

Pros: Don't have to cut into the stock harness. Plugs in perfectly. Colors on wires are industry standard.

Cons: Not all pin spots filled. Need to modify the wiring so it'll work with the steering wheel controls or cut into the car radio harness.


Written By Daniel A., Naperville, IL on Monday, January 19, 2015

My first time wiring a aftermarket radio and it was really simple u just matched the colors and u can put your stock radio back in whenever u want too.

Pros: Very easy and simple u don't really need the instructions.

Cons: the should make it a double way adapter.

Works as advertised

Written By Anonymous, Grandville, MI on Friday, January 16, 2015

Crutchfield Customer Review (What's this?)

Does the job well.

Pros: Works great, easy and quick install.

Cons: None

Metra 70-7903 Receiver Wiring Harness

Written By Edwin, California on Thursday, January 01, 2015

Crutchfield Customer Review (What's this?)

Simple wire harness

Pros: Easy set up and installion.

Cons: None

Needs help

Written By Ken, Sedona, AZ on Tuesday, November 18, 2014

Crutchfield Customer Review (What's this?)

The harness fits a Miata but 2 of the pins don't have or match the factory harness, hence you need to bypass the harness union...not good as they don't tell you this!

AMAZING and Simply

Written By Mr Bacon, Las Vegas, NV on Monday, November 03, 2014

Crutchfield Customer Review (What's this?)

Easy and best way to use the current wiring even with factory amp and sub woofer.

Pros: Easy and simply

Cons: NONE

Works perfectly

Written By Lee, Boston, MA on Tuesday, August 23, 2005

Crutchfield Customer Review (What's this?)

Took me 15 minutes to wire this harness up to my Kenwood stereo. Didn't really need the directions as the color codings were pretty much dead on. It even works with the dimmer in my car. Great product.

Hands-on research

What's in the box?

Download owner's manual

  • Receiver wiring harness

Product Research


Crutchfield Wiring Harness: Crutchfield wiring harnesses prevent you from having to cut your vehicle's factory radio plug when replacing your factory radio with an aftermarket head unit. Simply solder or crimp the Crutchfield wiring harness to your aftermarket head unit's harness (solder & crimps not included), plug the aftermarket head unit's plug into the rear chassis of the aftermarket head unit, and plug the Crutchfield wiring harness into your vehicle's factory radio plug.

Note: Installation tools, hardware, & accessories are not included & sold separately. Please see the Accessories tab for recommendations & availability.

Wiring Notes: If the Crutchfield wiring harness is not equipped with a ground wire, you will need to ground the aftermarket head unit's ground wire to the metal chassis of your vehicle. Some vehicle's may require you to bypass the vehicle's factory amplifier (in another location from factory radio) or hardwire certain connections. If your vehicle is equipped with factory steering wheel controls, an additional adapter is required & sold separately.

Wire Code Chart:

Wire Color Function
Red +12 Volt Accessory
Yellow +12 Volt Constant
Black Chassis Ground
Blue Power Antenna
Blue/white Amp Turn-On
Orange Illumination
White Left Front Speaker +
White/Black Left Front Speaker -
Gray Right Front Speaker +
Gray/Black Right Front Speaker -
Green Left Rear Speaker +
Green/Black Left Rear Speaker -
Violet Right Rear Speaker +
Violet/Black Right Rear Speaker -

The Crutchfield Car Selector: Please visit the Crutchfield Car Selector for your specific type of vehicle.

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