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Metra 70-5521

Amplifier Harness for Select 2003-2005 Ford Vehicles

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List price $29.99

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$7.99

with warranty

Order within 61 hrs 21 mins to ship 12/12

Arrives by Monday, Dec. 19 to zip 94107

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Metra Audio Store

Product Features:

  • Factory amplifier integration harness
  • 2 RCA Plugs plug into aftermarket radio's pre-amp outputs
  • One 24-pin power plug and one 8-pin subwoofer plug
  • 1.5K Ohm resistor can be used on the amp-remote wire to eliminate turn-on pop
  • Allows for the installation of an aftermarket radio using the existing factory wiring and connectors
  • No cutting of factory wiring needed
  • Compatible with select 2003-2005 Ford vehicles
  • 1-year Manufacturer's warranty

Connections:

  • 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.
Install a Car Stereo & Bypass the Factory OEM Amplifier
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.
Ford
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.
Ford Aerostar
Ford Aspire
Ford Bronco
Ford Contour
Ford Crown Victoria
Ford Econoline
Ford Edge
Ford Escape
Ford Escort
Ford Excursion
Ford Expedition
Ford Explorer
Ford F-150
Ford F-250
Ford F-350
Ford F-450
Ford F-550
Ford Flex
Ford Focus
Ford Freestar
Ford Freestyle
Ford Fusion
Ford Mustang
Ford Ranger
Ford Taurus
Ford Thunderbird
Ford Windstar

Warranty and Return Policy

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

Summary of Customer Ratings & Reviews

Rating Distribution

5 Star
77%
4 Star
8%
3 Star
15%
2 Star
0%
1 Star
0%

Average Attribution Rating

Durability
4.5
Value
4.7
Features
4.3
Design
4.5
Usability
4.5
Vinnie

Taylors, SC

Overall
Durability
Value
Features
Design
Usability
It restored the deep bass to my SUV...

December 31, 2013

Metra harnesses are great quality harnesses. There is a reason that they are the first choice of a vast majority of pro installers. While I'm not a pro, I am quite proficient in the realm of audio installations and I too prefer metra products(although on occasion I have used scosche products as well). This harness includes, besides the interface from aftermarket head unit to the stock vehicle harness, the harness to put the stock sub and amp back into your system when installing an aftermarket head unit. If you already have an aftermarket head unit and just need to integrate the stock sub into your aftermarket system, metra makes a harness for that purpose as well(as I found out after I ordered this harness) and the model number of that harness is 70-5522. Either way, you really can't go wrong and this harness will get the job done and help you to install your aftermarket system with no cutting required to the stock harness. A caveat with the stock sub interface, tho. Be sure to also either install a ready made 12v to 5v inline converter on the remote turn on line, or, if you are aptly capable, install a 7805 regulator should you have one laying around(this was the route I took because I actually did have one laying around). The reason for this is to avoid a loud pop when turning on the amp because of a voltage mismatch between the common remote lead of most systems and the remote lead in on the stock amp.

29 of 33 found this helpful

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TOP

Fayetteville Arkansas

Overall
Durability
Value
Features
Design
Usability
1SG SETTLE

April 12, 2015

This piece was very easy to use and it took a lot of work out of the job I used it in a Mustang none of the colors were right but with this kit it really made it easy I highly recommend it

17 of 19 found this helpful

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Kyle

Lathrop Ca

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Durability
Value
Features
Design
Usability
Sonic saved us

February 27, 2012

My sisters fiance has an 04 f150. About a year ago when him and my sister came down from washington i took him to a local audio shop and he got a jvc 7 inch touch screen installed. We later found out that the factory sub no longer worked, went back to the shop and asked them to fix it. They said it would take 45 minutes (my sister didn't want to wait nor did her fiance). This last week they were down again and still no subwoofer. So i came to Sonic and got this harness. Pulled out the deck, hooked it up in about 15 minutes and wahh lahh. The sub worked again, without sonic we would have bought an amp wiring kit, and a new amp.

18 of 21 found this helpful

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Craig

richmond, VA

Overall
Durability
Value
Features
Design
Usability
Seamless

February 16, 2015

This is what you need for your Ford 2005 Mach system (with subwoofer). Was worry about installation, but worked out perfect. The Sub does "POP" due to the 12V antenna from head unit. I hear you need a 5V conversion to solve this problem. Doesn't bother me now.

18 of 23 found this helpful

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Ted

Monson, MA

Overall
Durability
Value
Features
Design
Usability
Super Easy

January 2, 2015

If you can match colors then you can hook up you radio in under 1 hour. I had to cut the wire covers a bit longer to wrap them befor clamping. All wires were labled also. Simple.

17 of 22 found this helpful

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Sherry

Coeur d Alene, ID

Overall
Durability
Value
Features
Design
Usability
Perfect Fit!

December 30, 2013

This product was a great fit and simplified my do-it-yourself installation by making an easy connection/fit between the after market stereo wiring and the stock stereo harness. The only thing that would have made it perfect would be if the harness had the two orange wire dimmer connector that both the stock harness and after market stereo had. The dimmer switch on stereo face doesn't work because of this but the front still lights up and looks great. The team at Sonic included everything i needed.

17 of 22 found this helpful

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Slipperman

Highland Park, IL

Overall
Durability
Value
Features
Design
Usability
Great fit

September 17, 2013

This is the harness needed to interface an aftermarket head unit with the MACH system in my '04 Mustang.
Everything worked great!

15 of 20 found this helpful

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foyle

Ardsley, NY

Overall
Durability
Value
Features
Design
Usability
Not complete for 2002 Expedition

February 9, 2012

Needed a second harness to activate the subwoofer. After a few back and forth emails to Sonic, they provided it free of charge.

14 of 19 found this helpful

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Omar

602 AZ

Verified Purchase
Overall
Durability
Value
Features
Design
Usability
NOTBAD

December 14, 2015

Its simple to install whether a pro or a beginner.
OK product for the price!

2 of 2 found this helpful

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Lee

Canada

Overall
Durability
Value
Features
Design
Usability
Great!

November 14, 2016

Used on my 2006 Mustang GT install, made it alot easier to attach speakers and subs

0 of 0 found this helpful

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twocvsix

Canada

Overall
Durability
Value
Features
Design
Usability
Excellent Product

July 19, 2016

This is the second time I have ordered one of these units. The first time was to install a no name Chinese touch screen radio into my 2004 Mustang. Well, that radio, sad to say is a piece of garbage, and I've since purchased a Jensen VX7022 to replace it with.

As I had to make some modifications to the Metra 70-5521 to fit the Chinese unit, I decided to order a brand new one for my new Jensen.

The fit to the radio is perfect and the whole installation looks like it was original equipment in my car.

I can't say enough about this product. This, together with a wiring harness kit makes for a very easy install, which, if you ever need to, can be removed, simply by unplugging everything, and the stock radio will go back as if it was never removed.

Thank you Metra!

0 of 0 found this helpful

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Norman

Yelm, WA

Verified Purchase
Overall
Durability
Value
Features
Design
Usability
Perfect Match for our 2004 Mercury Marauder

March 29, 2016

This Wire Harness Connector Kit made it easy to interface our New Pioneer unit to our existing Mercury/Ford wiring and even interfaced to our existing factory powered sub-woofer.

0 of 0 found this helpful

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David

San Carlos, CA

Overall
Durability
Value
Features
Design
Usability
Metra Ford adapter

March 13, 2016

This is the model to use if your Ford radio has a subwoofer, such as the Shaker 500. The Sonic website doesn't read that way. Be aware that an aftermarket subwoofer turn on circuit operates at 12V whilst the Shaker uses 5V. Because of this you might hear a pop noise when you turn on the new head unit or switch between audio sources. There are several ways to fix this. It's either a voltage regulator or resistor. As for the adapter itself, it's a nice piece. You don't have to cut factory wires. The connections are all color coded correctly so that you only have to match Metra wires with the wires coming from the aftermarket head unit. The instructions aren't all that good.

0 of 0 found this helpful

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Browse 1 question and 8 answers
Hide answersShow all answers | Sort by
Why did you choose this?
Sonic Electronix Store
Mach Audio system harness
Derrick S on Nov 16, 2016
It was the adapter required for a 2006 Ford Mustang GT with the Shaker 1000 sound system.
Phillip H on Oct 21, 2015
Required to hook up an aftermarket stereo to the stock speakers and amps in an '04 Mustang with a Mach 460.
Dave M on Nov 2, 2015
GOOD BRAND
DOMINGO C on Sep 17, 2015

Product Summary

Manufacturer

Model Number

70-5521

UPC

086429129522

Weight

0.23lbs

Internal SKU

met-705521

Internal Product ID

12664

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 70-5521