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🔧 Upgrade your Ford’s sound system without the drama!
The METRA 70-5521 is a precision-engineered amp integration/sub harness designed for 2003 and newer Ford vehicles. Made in the USA, it offers a plug-and-play RCA connector system that preserves your OEM wiring, ensuring a clean, professional installation. Trusted by thousands of users, this harness seamlessly supports factory amps and subwoofers, making it the go-to choice for upgrading your car audio with zero compromise.


| Brand | Metra |
| Connector Type | RCA |
| Item Weight | 0.02 Pounds |
| Item dimensions L x W x H | 1 x 1 x 1 Millimeters |
| Manufacturer | METRA |
| UPC | 086429129522 |
E**.
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.
J**F
Does the job, I was just unclear as to wether I needed the amp out plug
Just bought a ‘04 Lincoln Town Car and didn’t know wether it had an amp/sub or not(couldn’t speak with original owner as it was purchased through a family member and the manual was missing) so I went with this harness because if I didn’t need the amp out harness no big deal, but if I did...well then I’d need it lol. The harness itself is perfect for what it is, a simple harness to prevent cutting and splicing the OEM harness, wires were clearly marked and colors matched the harness for the after market stereo. Went with the Pioneer AVH-X490BS, if you get a pioneer look into getting the parking brake bypass switch. The only problem is that there was nowhere to connect the two blue wires on the harness with the RCA plugs, so I assumed I didn’t need it and just didn’t use it. Reconnected negative terminal on battery and tested radio and it worked great so I figured I was right. I go to install the Infinity Kappa speakers in the rear deck(btw if you have a Town Car be ready to take out the entire rear seat, both bottom and rear cushions to get access to the speakers......) and guess what I see?? A sub and amp.... I was planning on getting an amp for the speakers anyways, and maybe a 8” sub just for a little bass so I’ll just wait to get them rather than hook up the factory amp/sub. If you're replacing a radio you can’t go wrong with Metra, always quality products. Been using them as long as I can remember, and between work, my personal vehicles and friends/family I’ve installed more car stereos and speakers than I can remember and never had an issue with Metra.
E**P
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!
R**N
Mostly worked for my 2010 F150
I used this to install an aftermarket stereo in our 2010 F150 with no Sync. I searched many places and couldn't locate the correct harness for my truck. I could tell physically this would fit so I used it, however I know it's not intended for my truck. That said all speaker connections were perfect, yellow memory and ground matched, only the illumination wire didn't match so I moved that pin. Great quality and worked well.
B**Y
Great, Cheap, and Affordable
It worked great easy to set up if you know what you are doing
Trustpilot
2 months ago
2 days ago