Name: Metra 70-5521 Receiver Wiring Harness
Brand: Metra
SKU: 120705521
Price: 14.99 USD
Availability: InStock
Rating: 4.5 (278 reviews)

Metra 70-5521 Receiver Wiring Harness

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

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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.

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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:

Metra 70-5521 Receiver Wiring Harness owner's manual

7" Receiver wiring harness
13" RCA harness

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Researched by Crutchfield's Stacey B.

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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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7 questions already asked

Does this harness retain the use of the factory steering wheel controls in the 2005 Expedition?

james Feb 01, 2024

1 answer

This Metra 70-5521 does not retain any steering wheel control functions, James. To see installation packages that fit your vehicle and retain steering wheel controls with radios that support it, please use our online Vehicle Guide in the link below. https://www.crutchfield.com/m_266150/Car-Stereos.html

bo Feb 01, 2024 (Staff)

This harness says it will work with Mazda. I have a 06 Mazda tribute with the factory sub and amp. Will this work?

aaron Apr 06, 2023

1 answer

Greetings Aaron, and thank you for your question. That harness works for a lot of different Ford and Mazda vehicles, but not your Tribute. What you would need is the harness below: www.crutchfield.com/p_120707903/item.html

hogan Apr 06, 2023 (Staff)

On the smaller plug there are 2 blue and white wires. Why are there 2 of them? What should I connect them to? I don't see any wires on the new Pioneer AVH-200EX or on the vehicle's wiring. Also the smaller plug does not seem to line up with the inputs of the factory plug.

rayc1245 Sep 02, 2019

2 answers

Don't know didn't install my.

donald Sep 04, 2019

Sorry,I can't help I had my stereo professional installed.

donald Sep 03, 2019

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

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/.

kenneth Apr 09, 2016 (Staff)

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

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

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.

kristina Aug 06, 2014 (Staff)

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

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)

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

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)

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