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Metra 70-7903 Receiver Wiring Harness

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

Item #: 120707903

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50 Reviews | 1 question - 1 answer

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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.

Connections:

  • 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:

50 Reviews

2003 Mazda Tribute

Written by: N. Farris from Santa Cruz, CA on February 3, 2016

2003 Mazda Tribute
Crutchfield Customer Review (What's this?)

Wiring harness was as expected, but between this and head unit instructions, it was not as easy as it should have been.

Pros: as expected

Cons: minimal instructions

No Issue

Written by: LEO K from California on January 15, 2016

2014 Mazda MX5
Crutchfield Customer Review (What's this?)

Installer had no problem and from look of it wires look durable and reliable

Pros:

Cons:

Harness for 2006 Mazda 3

Written by: CG from Texas on January 9, 2016

2006 Mazda 3
Crutchfield Customer Review (What's this?)

Easy to use and good instructions!

Pros: Plugs right into your car and you splice to the stereo harness easily.

Cons: None

Wiring harness

Written by: DylanC from Oviedo fl on January 9, 2016

2007 Mazda 3
Crutchfield Customer Review (What's this?)

Nice and easy to install

Pros: Easy and colors matched up nice with factory harness

Cons: None

great harness adapter worked perfectly with minor changes

Written by: Wes M. from Florida on January 6, 2016

2006 Mazda MX5
Crutchfield Customer Review (What's this?)

installed on 06 mazda mx5 with axxess steering wheel adapter to Pioneer FH-X720BT. did not add amp or other speakers. I did have to move the blue and blue/white wires over to the 1N and !P positions to which one went to the white and green on the axxess and the 1p to the grounds that the axxess and the radio used. otherwise a flawless installation with easy color matching.

Pros: perfect color matching other than mentioned wire exchange. precut wires make for quick install. perfect fit for my mazda mx5 nc

Cons: had to move to wires that it could have come preinstalled with but move was simple and took 2mins max.

2012 Mazda Dash Install

Written by: Kal from Pennsylvania on January 2, 2016

2012 Mazda 3
Crutchfield Customer Review (What's this?)

Nice harness, wire colors match perfectly with a Pioneer receiver. Took some time to figure out the steering wheel control wiring. As much the fault of the wheel control instructions, but something Metra can keep in mind for the next generation of harnesses.

Pros: Easy, straightforward install.

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

About as easy as it could be

Written by: nw from Indiana on December 30, 2015

2004 Mazda MPV
Crutchfield Customer Review (What's this?)

The harness was fine - nothing special about it - it worked as expected. Would have liked to have seen some additional options so we didn't have to "tap in" to a few of the lines manually.

Pros: The lines were color coded and labelled appropriately. Some of the lines we weren't going to need were already marked with tape.

Cons: We did have to use "t-taps" to splice into the existing steering wheel lines. While easy enough to do, it was something we had to learn about first with the Crutchfield Representative and stop the project to go purchase additional parts at the hardware store. It was very straightforward to accomplish the install, but I think the kit should have come with these extra pieces. We lost time having to research and buy additional parts.

Missing pins for steering wheel control

Written by: Espierce from Alabama on December 23, 2015

2013 Mazda MX5
Crutchfield Customer Review (What's this?)

I had to tap into the wiring harness in order to get to the steering wheel control signals. The addition of two wires on the metra harness would have saved much time. Email to metra tech support were unanswered.

Pros:

Cons:

Easy install

Written by: Anonymous from California on December 6, 2015

Crutchfield Customer Review (What's this?)

Made the install super easy. Worked like I expected.

Pros: All good

Cons: none

Helpful harness

Written by: SteveB from Florida on December 5, 2015

Crutchfield Customer Review (What's this?)

Harness made installation easy.

Pros: Very easy to make all Connections bench then install

Cons:

Exactly what I was looking for

Written by: Matthew from Pell City, AL on November 23, 2015

2004 Mazda Tribute
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.

Pros:

Cons:

Metra 70-7903 Receiver Wiring Harness

Written by: The Fixer from California on November 16, 2015

2003 Mazda Protege
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 from Indiana on November 16, 2015

2007 Mazda MX5
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 from SanFrancisco on 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 from New York on October 28, 2015

2008 Mazda MX5
Crutchfield Customer Review (What's this?)

Perfect fit.

Pros:

Cons:

Just missed being perfect

Written by: W from Monroe, NY on 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 from Florida on October 18, 2015

2006 Mazda MX5
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 from Indiana on October 16, 2015

2001 Mazda Protege
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

Great

Written by: Scott from henderson, nv on October 12, 2015

2002 Mazda Protege
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 from Minnesota on October 8, 2015

2005 Mazda 3
Crutchfield Customer Review (What's this?)

Easy to install and program. Works flawlessly

Pros:

Cons:

Simple.

Written by: Jim D. from California on September 29, 2015

2006 Mazda MX5
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 from Pennsylvania on 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

Cons:

Works perfectly

Written by: AviT from Oregon on September 17, 2015

2003 Mazda Protege5
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.

Pros:

Cons:

Metra 70-7903 Receiver Wiring Harness

Written by: Anonymous from Charleston, SC on September 15, 2015

2008 Mazda 3
Crutchfield Customer Review (What's this?)

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

Pros:

Cons:

Awesome Product

Written by: Luke P from Indiana on September 10, 2015

2004 Mazda 6
Crutchfield Customer Review (What's this?)

Made radio installation a breeze.

Pros: easy installation

Cons: none

Metra Harness for MX 5

Written by: MedLex from Puerto Rico on July 27, 2015

2008 Mazda MX5
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

Satisfied

Written by: Jorge from Puerto Rico on July 15, 2015

2003 Mazda Protege
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 from Massachusetts on July 12, 2015

2006 Mazda 3
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.

Pros:

Cons:

Amazing

Written by: Connor from Minnesota on July 3, 2015

2003 Mazda Protege
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 from Florida on June 24, 2015

2006 Mazda 5
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

Cons:

Wiring Harness

Written by: JohnR from Florida on June 12, 2015

2002 Mazda Miata
Crutchfield Customer Review (What's this?)

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

Pros:

Cons:

Metra wiring harness

Written by: Anonymous from Clarksville, TN on June 6, 2015

2001 Mazda 626
Crutchfield Customer Review (What's this?)

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

Pros:

Cons:

Metra 70-7903 Receiver Wiring Harness

Written by: Anonymous from New Port Richey, FL on June 5, 2015

2006 Mazda MX5
Crutchfield Customer Review (What's this?)

Very straight forward.....no problems

Pros:

Cons:

Metra 70-7903 Receiver Wiring Harness

Written by: Anonymous from New Mexico on June 1, 2015

2006 Mazda MX5
Crutchfield Customer Review (What's this?)

missing pins for steering wheel controls

Pros:

Cons:

Beware of missing pins!

Written by: Robert from California on 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 from Wisconsin on May 25, 2015

2015 Mazda MX5
Crutchfield Customer Review (What's this?)

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

Pros:

Cons:

Great but...

Written by: Mike V from Simi Valley, California on 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 from Massachusetts on 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 from Brooklyn, mi on May 8, 2015

2007 Mazda MX5
Crutchfield Customer Review (What's this?)

Made installation a breeze.

Pros:

Cons:

Very Good Harness

Written by: Tj from Frederick MD on April 10, 2015

2004 Mazda Tribute
Crutchfield Customer Review (What's this?)

Excellent installation kit. Fit the factory harness perfectly

Pros:

Cons:

Great harness!

Written by: Anonymous from Maryland on April 8, 2015

2007 Mazda 3
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 from Redmond, WA on February 22, 2015

2006 Mazda MX5
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 from California on February 10, 2015

2002 Mazda Protege
Crutchfield Customer Review (What's this?)

It works. Hooray.

Pros:

Cons:

Cheaped out

Written by: ChrisC from Phoenix, AZ on February 6, 2015

2008 Mazda MX5
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.

Beginner

Written by: Daniel A. from Naperville, IL on 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 from Grandville, MI on January 16, 2015

2005 Mazda 3
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 from California on January 1, 2015

Crutchfield Customer Review (What's this?)

Simple wire harness

Pros: Easy set up and installion.

Cons: None

Needs help

Written by: Ken from Sedona, AZ on 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!

Pros:

Cons:

AMAZING and Simply

Written by: Mr Bacon from Las Vegas, NV on November 3, 2014

2003 Mazda MPV
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 from Boston, MA on August 23, 2005

2003 Mazda Protege5
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.

Pros:

Cons:

Hands-on research

What's in the box?

Download owner's manual

  • Receiver wiring harness

Product Research

Features

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.

Our Product Research Team

At Crutchfield, you'll get detailed, accurate information that's hard to find elsewhere. That's because we have our own in-house Product Research team. They verify what’s in the box, check the owner's manual, and record dimensions, features and specs. We stay on top of new products and technologies to help people make informed choices.

Customer Q&A

Crutchfield asked  
Why did you buy this?

I chose this because it was needed for the stereo head unit that I purchased. [ Blake  Jan 14, 2016 ]
These have worked great in the past. This one will be my 4th or 5th through Crutchfield. I have only had 1 install issue, and they had me on the right track in minutes. Takes some time, but, is easy. Do a good solder, use shrink tube, and you will look like a pro. Beats the heck out of rewiring the entire system. [ Earl  Dec 15, 2015 ]
It's we what I needed to install the stereo, plus it was free [ Terry  Dec 10, 2015 ]
Based on my history with Crutchfield, if they recommend it, I order it.....Crutchfield has the best service, bar none!! [ Kevin  Dec 08, 2015 ]

1 question already asked

For details on fit or installation please contact an Advisor by phone (1-800-324-9695) or online chat. They will be able to pull up your vehicle and give you the details on if this will fit and what you will need for an installation in your vehicle. [ Krissy  Sep 14, 2015 ]  Staff

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