---
product_id: 213512802
title: "METRA 70-5521 2003 & Up Ford(R) Amp Integration/Sub Harness"
brand: "metra"
price: "HK$543"
currency: HKD
in_stock: true
reviews_count: 5
category: "Metra"
url: https://www.desertcart.hk/products/213512802-metra-70-5521-2003-and-up-ford-r-amp-integration
store_origin: HK
region: Hong Kong
---

# Optimized for Ford amp integration Seamless RCA connectivity Proudly USA made METRA 70-5521 2003 & Up Ford(R) Amp Integration/Sub Harness

**Brand:** metra
**Price:** HK$543
**Availability:** ✅ In Stock

## Summary

> 🔊 Upgrade your Ford’s audio game with Metra’s precision harness!

## Quick Answers

- **What is this?** METRA 70-5521 2003 & Up Ford(R) Amp Integration/Sub Harness by metra
- **How much does it cost?** HK$543 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.hk](https://www.desertcart.hk/products/213512802-metra-70-5521-2003-and-up-ford-r-amp-integration)

## Best For

- metra enthusiasts

## Why This Product

- Trusted metra brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Made in the USA:** Support local manufacturing with a harness proudly produced on American soil.
- • **Plug & Play Precision:** Effortless RCA harness designed specifically for 2003+ Ford models, ensuring perfect fit and function.
- • **Boost Your Sound System:** Integrates seamlessly with your vehicle’s amplifier and subwoofer for enhanced audio performance.
- • **Authentic Quality Assurance:** Original branded Metra product crafted with premium materials for durability and reliability.
- • **Highly Rated by Enthusiasts:** Trusted by thousands with a solid 4.4-star rating, proving its value and performance.

## Overview

The METRA 70-5521 is a high-quality, USA-made RCA amp integration/sub harness designed specifically for 2003 and newer Ford vehicles. It ensures seamless connectivity between your factory amplifier and aftermarket audio components, delivering reliable performance backed by strong customer satisfaction.

## Description

METRA 70-5521 2003 & Up Ford(R) Amp Integration/Sub Harness

Review: Excelente producto - El arnes quedó a la perfección, muchas gracias solo que al querer conectar el arnes chico mi camioneta ya no trae el conector macho que es para el subwoofer de fabrica que trae la camioneta la cual es una explorer eddie bauwer 2005.
Review: Be Careful - This just arrived after waiting patiently for its arrival from the USA. Unfortunately this does not fit the Ford Explorer 05 as stated. Good quality item, but clearly a waste of time and money as seller is USA based, this isn't worth a return!

## Features

- Best Quality
- Original Branded Product

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B000K50GTA |
| Brand | Metra |
| Brand Name | Metra |
| Connector Type | RCA |
| Country of Origin | USA |
| Customer Reviews | 4.4 out of 5 stars 3,746 Reviews |
| Global Trade Identification Number | 00086429129522 |
| Item Dimensions | 1 x 1 x 1 Millimeters |
| Item Weight | 9 g |
| Item dimensions L x W x H | 1 x 1 x 1 Millimeters |
| Manufacturer | METRA |
| Model Number | 70-5521 |
| Part Number | 70-5521 |
| UPC | 086429129522 |

## Product Details

- **Brand:** Metra
- **Connector Type:** RCA
- **Item Weight:** 9 g
- **Item dimensions L x W x H:** 1 x 1 x 1 Millimeters
- **Manufacturer:** METRA

## Images

![METRA 70-5521 2003 & Up Ford(R) Amp Integration/Sub Harness - Image 1](https://m.media-amazon.com/images/I/61CORK-mQCL.jpg)
![METRA 70-5521 2003 & Up Ford(R) Amp Integration/Sub Harness - Image 2](https://m.media-amazon.com/images/I/61TqkIDoIbL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Excelente producto
*by E***. on 26 January 2023*

El arnes quedó a la perfección, muchas gracias solo que al querer conectar el arnes chico mi camioneta ya no trae el conector macho que es para el subwoofer de fabrica que trae la camioneta la cual es una explorer eddie bauwer 2005.

### ⭐ Be Careful
*by E***P on 12 August 2020*

This just arrived after waiting patiently for its arrival from the USA. Unfortunately this does not fit the Ford Explorer 05 as stated. Good quality item, but clearly a waste of time and money as seller is USA based, this isn't worth a return!

### ⭐⭐⭐⭐⭐ Perfect for 05-09 Mustangs with Shaker 500
*by C***O on 16 September 2012*

Metra 70-5521 Crutchfield claims this kit does not exist or work on my 07 Mustang with the Shaker 500, and insisted I purchase an expensive PAC kit that requires soldering a diode. With the 70-5521, there are 2 harnesses. The large one is for the main radio harness, the smaller one is for the Shaker 500 subwoofers. You will need a LM7805 or equivalent voltage regulator to convert a 10-15 V signal into a 5V signal. The LM7805CT voltage regulator was needed because the Ford factory Shaker 500 amplifiers require a 5V turn-on signal, while aftermarket receivers use 12V turn-on signals for the amps. This results in a pop or overload of the amp turn-on. The LM7805CT seems to do the trick, and I was told by other Mustang owners not to worry about heatsinks or cooling the regulator because the current/power dissipation isn't that great. I also observed that it was definitely possible to tap into the light/illumination leads for either the message center harness or the HVAC harness to enable the dimming feature on the CX501, but I opted not to touch the factory wiring. The main factory harness does NOT have a power antenna (solid blue), amp turn-on (blue/white) or phone mute (brown) so those must be sealed/wrapped off on the big Metra harness. The smaller Metra harness that goes to the Shaker 500 will have a pair of amp turn-on leads (blue/white) that attach to the OUTPUT side of the LM7805. The INPUT side of the LM7805 goes to the amp turn-on lead coming from the receiver harness. The RCA inputs for the Shaker 500 subs go to the appropriate RCA jacks on the back of the receiver. I soldered all of the ground leads together which goes back to the receiver harness ground lead. I used solder and heatshrink wrapping and can confirm that this wiring kit will work on a 05-09 Mustang (or at least the 2007). Overall: 5/5 stars, very inexpensive, not hard to use, just remember to buy a 5V regulator from Radio Shack - I opted to buy my Fairchild LM7805CT from Digi Key so that I knew I was getting a quality regulator.

## Frequently Bought Together

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*Product available on Desertcart Hong Kong*
*Store origin: HK*
*Last updated: 2026-09-29*