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Metra 70-5521 Receiver Wiring Harness

Connect a new car stereo in select 2003-up Ford, Lincoln, Mazda, and Mercury vehicles

Item # 120705521

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

Find what Fits your car

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

Item # 120705521

In stock
C$21.99

About the Metra 70-5521 Receiver Wiring Harness

Metra 70-5521 Receiver Wiring Harness

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

Metra 70-5521 Receiver Wiring Harness

Installation Note: This harness uses your factory amplifier; your new stereo must have one pair of preamp outputs to connect this 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 makes installing your new stereo easier, and allows you to put the factory radio back when you sell your vehicle or return it at the end of the lease. 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.

READ LESS
Connections
  • 12V constant power
  • 12V switched power
  • chassis ground
  • dimmer
  • left front speaker +/-
  • right front speaker +/-
  • left rear speaker +/-
  • right rear speaker +/-
  • amp turn on
  • RCA cables for the signal to the woofers
  • MFR # 70-5521

What's in the box:

  • 7" Receiver wiring harness
  • 13" RCA harness

Customer reviews

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Metra 70-5521 Receiver Wiring Harness reviews

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More details on the Metra 70-5521 Receiver Wiring Harness

Stacey B.

Product Research

Features

Wiring Harness: This wiring harness prevents 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 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 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 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:

(Receiver Wiring Harness)

Wire Color Function
Red +12 Volt Accessory
Yellow +12 Volt Constant
Black Ground
Blue Power Antenna
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 -

(Amp Turn-On/Subwoofer Wiring Harness)

Wire Color Function
Empty (none)
Blue/White Amp Turn-On
Blue/White Amp Turn-On
White RCA Left Subwoofer Channel
Red RCA Right Subwoofer Channel

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Customer Q&A

Q
Crutchfield asked: Why did you buy this?
A
Takes the guess work out of it. [ Everett  Sep 07, 2019 ]
A
because [ Reyne  Aug 10, 2019 ]
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Ease of install [ Albert  Jul 11, 2019 ]
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Needed. It [ WILLIAM A  Jul 01, 2019 ]
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part of the install kit [ david  May 04, 2019 ]
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Needed it for installation and it was free. [ David  Apr 09, 2019 ]
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needed [ rwm189sr  Mar 26, 2019 ]
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Calvin recommended it for the Pioneer AVIC-W8400NEX [ ALEJANDRO RAMOS  Mar 21, 2019 ]
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Because it was free [ E  Mar 08, 2019 ]
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Faster installation [ james  Feb 19, 2019 ]
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Attaches to the existing wiring harness and avoids you not having to cut wires [ Noah  Feb 11, 2019 ]
A
I need it for my new stereo [ Samuel  Feb 05, 2019 ]
A
Free ! [ jason  Jan 25, 2019 ]
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Slows down install process [ Calistro  Jan 20, 2019 ]
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For installation of reciever [ Daniel  Jan 19, 2019 ]
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Price, things come complete plug and play [ E  Jan 01, 2019 ]
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ease and best connection to vehicle wiring [ Vincent  Dec 29, 2018 ]
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Recommended [ Thomas  Dec 27, 2018 ]
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Because it was recommended for installation [ Shirley  Dec 18, 2018 ]
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Ease of installation [ Benjamin  Dec 10, 2018 ]
A
Factory wiring harness makes installation a breeze. [ Jamie  Dec 02, 2018 ]
A
this worked well for the installation of the other radio I bought from crutchfield. [ PHILIP  Nov 25, 2018 ]
A
Good brand [ Trent  Nov 20, 2018 ]
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came with purchase [ Jeffrey  Nov 20, 2018 ]
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It was recommended [ Harding  Nov 19, 2018 ]
A
For this price you can't go wrong. Buy the harness and you know it will work. [ Kevin  Oct 02, 2018 ]
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included [ Barry  Sep 22, 2018 ]
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Same as above. [ Jesse  Sep 21, 2018 ]
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That's the harness I needed to install aftermarket radio [ Justine  Sep 19, 2018 ]
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Upgrade 2004 Mustang radio to new Pioneer keeping Mach speakers [ Skylar  Sep 14, 2018 ]
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Recommended by CF [ Owen  Sep 10, 2018 ]
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Time saver. [ Richard  Sep 04, 2018 ]
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Needed for "new" 2004 T-Bird. Traded my Pacifica but kept my pioneer receiver purchased from Crutchfield 7 months ago. [ Donald  Sep 04, 2018 ]
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To make install easy and simple. [ Colin  Aug 31, 2018 ]
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Advisor made it sound easy to install. [ Troy  Aug 24, 2018 ]
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Need to mate new stereo with existing wiring in car. Actually selected option to have Crutchfield make the appropriate wiring for my car for $25. [ Daniel  Aug 24, 2018 ]
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recommended by Troy [ ROBERT P  Aug 17, 2018 ]
A
Faster install time for my shop [ KEITH D  Aug 01, 2018 ]
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Ease of installation [ Scott  Jul 08, 2018 ]
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needed for install [ james  Jul 06, 2018 ]
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Required for the install [ Robert the Runner  Jun 24, 2018 ]
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For easy hookup. [ Roland  Jun 11, 2018 ]
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Included with purchase. [ Mark Michael  May 05, 2018 ]
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It was chosen for me by Crutchfield. [ Scott  Apr 16, 2018 ]
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I wanted to make the wiring easier for me. [ Cole  Apr 12, 2018 ]
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Fits my application [ Julian  Apr 09, 2018 ]
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makes for simple install of aftermarket audio to factory harness [ Charles  Mar 18, 2018 ]
A
Auto-selected by Crutchfield to connect to my vehicle. [ Kris  Mar 12, 2018 ]
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I need these so I don't have to cut or compromise my factory harness and continue to use my factory sub woofer. [ Bill  Mar 02, 2018 ]
A
Less painful wiring [ Ray  Jan 30, 2018 ]
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Absolutely necessary with an aftermarket system [ Blake  Jan 30, 2018 ]
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your recommendation on your site [ Pete  Jan 24, 2018 ]
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Because I purchased a car audio receiver with the incorrect wiring harness for the vehicle and had no way to return the original wiring harness that I purchased with the stereo. [ John  Jan 12, 2018 ]
A
This is my second JVC car stereo from Crutchfield and the last one served it's purpose so why not buy another, besides no one can beat their prices or customer service. [ james  Jan 12, 2018 ]
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I am correcting a wiring mistake made by the previous owner of the vehicle. [ Tim  Dec 27, 2017 ]
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Free bundled with purchase. [ Patrick  Dec 08, 2017 ]
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They are a Christmas gift for my husband. [ Rhonda  Dec 05, 2017 ]
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Value [ Rodney  Nov 27, 2017 ]
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Was told I would need this for fit [ Michael  Nov 25, 2017 ]
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Install a new radio [ harold  Nov 25, 2017 ]
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Crutchfield recommended these harnesses, so I'm trusting them that I need this to complete my radio installation project. [ Ram  Nov 07, 2017 ]
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makes it easier to install [ James  Nov 06, 2017 ]
A
Makes the installation easier [ Daniel  Oct 16, 2017 ]
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Its needed for my project [ Ernest  Oct 13, 2017 ]
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you say it fits [ HENRY  Oct 03, 2017 ]
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Recommended equipment [ A Thomas  Oct 01, 2017 ]
A
This was required for a new deck installation in my Ford Five Hundred. [ DanielC  Sep 04, 2017 ]
A
I always buy the wire harness. [ Gary  Aug 24, 2017 ]
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Recommended by other enthusiasts. [ carlos  Aug 10, 2017 ]
A
It was the harness i needed, thank you crutchfield [ Jason  May 31, 2017 ]
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I don't want to chop factory plugs [ Sean  May 25, 2017 ]
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Easy to connect aftermarket to factory harness [ Christopher  May 24, 2017 ]
A
This Metra wiring harness made installing the receiver a breeze....easy to follow instructions and the team from CRUTCHFIELD always has your back!!!!!! [ Christian  May 18, 2017 ]
A
easy way to install aftermarket stereo into my auto [ Karl  May 10, 2017 ]
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Recommended for installation [ David  May 07, 2017 ]
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Crutchfield suggested [ Amanda  May 05, 2017 ]
A
2007 mustang needs [ E  Apr 17, 2017 ]
A
Needed to install aftermarket radio into my 07 mustang gt [ TUCKER  Apr 02, 2017 ]
A
Ease of installation [ Robert  Mar 26, 2017 ]
A
Want to reinstall radio purchased from you 2 years ago into different vehicle [ Stevven  Mar 25, 2017 ]
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I have always used metra harnesses. [ darrell lee  Mar 24, 2017 ]
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Makes installation easier. [ James  Mar 21, 2017 ]
A
Used before good product [ DARRIEN  Mar 18, 2017 ]
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I bought this because I didn't know I had a subwoofer & ordered my new stereo without a subwoofer. The harness sent to me did not work. Hopefully this one will work. [ ERIK  Mar 11, 2017 ]
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I needed it to replace my stock stereo and it was such an excellent deal when combined with the stereo I purchased. [ Jordan  Mar 08, 2017 ]
A
Yo sweet [ Dean  Mar 07, 2017 ]
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it also fits [ Greg Worrell  Mar 02, 2017 ]
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Said I would need this and from past experience they know what they are talking about. [ Paul  Feb 25, 2017 ]
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Easy to install [ Robert  Feb 01, 2017 ]
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Need it for install. [ CHRISTOPHER  Jan 16, 2017 ]
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Default and free [ Robert  Jan 05, 2017 ]
A
Get the harness!! So much easier of an install [ JEREMIAH  Jan 05, 2017 ]
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ease of install [ Robert  Dec 30, 2016 ]
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Suggestion from you [ wrhfl200  Dec 05, 2016 ]
A
Replacing factory Shaker 500 head unit. [ J  Dec 04, 2016 ]
A
Came with Kit and needed for Install [ Paul  Dec 03, 2016 ]
A
A must have for an easy installation of radio [ Daniel  Nov 29, 2016 ]
A
Professional look [ Monty  Nov 26, 2016 ]
A
it fits the factory wiring harness in my vehicle [ Thomas L.  Nov 25, 2016 ]
A
Cutting stock wires = not cool. [ Donna  Nov 23, 2016 ]
A
recommended by you [ Mark  Nov 22, 2016 ]
A
Also the only one available for my system. [ gabriel  Nov 11, 2016 ]
A
makes installation a breeze [ Brian  Oct 24, 2016 ]
A
For ease of install. [ Floyd  Oct 09, 2016 ]
A
Recommended by Crutchfield [ Roger  Sep 22, 2016 ]
A
Cost [ Ron  Sep 18, 2016 ]
A
Adapting after-market radio to vehicle. [ Jeffrey Jay  Sep 17, 2016 ]
A
To upgrade my factory speakers . [ Fernando  Sep 03, 2016 ]
A
It is a easy set up. [ Jennifer  Sep 01, 2016 ]
A
Also part of the kit, but it is the main reason I bought the kit. Installation is much easier with the harness adaptor. [ Charles  Aug 28, 2016 ]
A
I didn't choose this item.. [ James  Aug 18, 2016 ]
A
fool proof wiring [ Douglas  Aug 16, 2016 ]
A
It was rated well and Kenwood. It fits my grandson's car. [ Gale  Aug 01, 2016 ]
A
Included in installation kit [ John  Jul 24, 2016 ]
A
This will make installation a lot easier to install an aftermarket radio. Also, it has the rca conversion wiring needed to use your oem door woofer with an aftermarket head unit. [ Alex  Jul 12, 2016 ]
A
I have installed a JVC receiver before with a harness and it worked without any problems [ John  Jun 27, 2016 ]
A
For my truck [ G  Jun 26, 2016 ]
A
The wiring harness was the last part I needed to install my new radio in my Marauder and Crutchfield was the only company that had the harness that I needed. Thank you. [ Stephen M.  Jun 21, 2016 ]
A
I will install new stereo on a 2005 Ford Mustang equipped with a Shaker1000 Sound System and want to keep the sub-woofers operational. I will update and rate the ease of installation as well as functionality of the wiring harness for future references (Update by 5/14/2016). Nestor_L [ Fuzzybarrel4563   May 04, 2016 ]
A
Becasue I need it to install my headunit with my car [ Donovan  Apr 29, 2016 ]
A
to install radio [ Chester  Apr 20, 2016 ]
A
It looks nice [ Lizbeth  Apr 09, 2016 ]
A
Its what i need to connect to my factory amp system [ Jason  Mar 29, 2016 ]
A
radio install [ KENNETH  Mar 29, 2016 ]
A
Free [ John E.  Mar 29, 2016 ]
A
Fits my 2004 Ford Expedition [ VIN  Mar 25, 2016 ]
A
needed to connect to existing wiring harness [ George  Mar 17, 2016 ]
A
NEEDED IT FOR PROPER INSTALLATION [ RAUL  Mar 15, 2016 ]
A
perfect [ JEFF  Mar 15, 2016 ]
A
Easy to install and to save time. [ LUIS  Mar 09, 2016 ]
A
One of the main reasons I shop Crutchfield. Free gear and easy install. Whoever thinks they can't install a car stereo, they are wrong. The simplified instructions Crutchfield provides is an absolute must have. Been shopping with them since 1991 (out of the catalog and mail back then). [ DWAYNE  Mar 02, 2016 ]
A
item was used for new Kenwood car stereo in a Ford Escape with a factory sub. [ ALEXI  Feb 26, 2016 ]
A
It comes with the stereo I ordered, so why not? [ Kevin S.  Feb 17, 2016 ]
A
Worked great [ Mark  Feb 15, 2016 ]
A
It fits my 2003 Lincoln Town Car [ Matthew  Jan 25, 2016 ]
A
comes with hardware suggested [ Christopher  Jan 21, 2016 ]
A
will always need it to be on the safe side of things [ marvin  Jan 06, 2016 ]
A
Got to have these. [ Bobby  Dec 15, 2015 ]
A
Free plus to make installation easier [ Mark  Dec 04, 2015 ]
SHOW MORESHOW LESS

5 questions already asked

Q
I have an 07 mustang gt with the shaker 500 this has two of the connections but i dont know what the third is?
[ zac  Apr 09, 2016 ]
1 answer
A
Thanks for your question. The product page lists what the connections are for: 12V constant power 12V switched power chassis ground dimmer left front speaker +/- right front speaker +/- left rear speaker +/- right rear speaker +/- amp turn on RCA cables for the signal to the woofers If you purchased the product from Crutchfield, feel free to contact our Tech Support team. They can walk you through the connections on the product. Our toll-free Tech Support number is printed on your invoice, and is also available under the "My Orders" tab in the "My Account" section of our website. If you did not purchase the unit from Crutchfield, then you may want to contact the manufacturer. You can also post your question in our forums: http://community.crutchfield.com. Or try our online support center: http://crutchfield.custhelp.com/app/answers/list/kw/.
[ Kenny  Apr 09, 2016 ]  Staff
Q
I have an 07 f-150 with the 8" factory sub and 6cd changer but on the back of my of my radio there is 3 individual harnesses. This product shows only 2 where does the 3rd harness plug into?, would I lose any features such as backup sensors? Or do I need another part? Thanks
[ Derek  Aug 02, 2014 ]
2 answers
A
I believe the other harness is for just the steering wheel controls. If you don't buy the steering wheel control adapter for your receiver, you will lose these functions.
[ KEVIN  Aug 07, 2014 ]
A
We have not received any answers from other customers on your question. I would recommend reaching out to an Advisor by phone (1-800-324-9695) or online chat. They should be able to help answer your question.
[ Krissy  Aug 06, 2014 ]  Staff
Q
so exactly what is this used for? it seems to say that it allows the shaker 500 subs and amp to be connected to the aftermarket radio, but then i read further on and it says i need a $100 adapter for them to work. so which one is it?
[ Brandi  Jan 06, 2014 ]
1 answer
A
This will depend largely on your vehicle. For details on installation please contact an Advisor by phone or online chat. They will be able to pull up your vehicle and give you the details on what you will need for an installation.
[ Jeff  Jan 06, 2014 ]  Staff
Q
I wired everything on the aftermarket receiver wiring harness correctly because when I plugged it in everything worked great. The only thing that didn't work were my factory subwoofers. I don't know how to connect the amplifier turn on wires that are connected to the red and white RCA cables. I don't know where the two blue/white wires connect to. Can someone please help me? My radio has been in my car for weeks now and I can't seem to get it to work properly.
[ Evan  Jan 03, 2014 ]
1 answer
A
If you purchased the product from Crutchfield, feel free to contact our Tech Support team. Our toll-free Tech Support number is printed on your invoice, and is also available under the "My Orders" tab in the "My Account" section of our website. If you did not purchase the unit from Crutchfield, then you may want to contact the manufacturer. You can also post your question in our forums: http://community.crutchfield.com. Or try our online support center: http://crutchfield.custhelp.com/app/answers/list/kw/.
[ Jeff  Jan 03, 2014 ]  Staff
SHOW MORESHOW LESS

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