Metra 70-5521 Wiring Harness

It restored the deep bass to my SUV...

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.

Sonic saved us

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.

1SG SETTLE

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

Seamless

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.

Super Easy

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.

Perfect Fit!

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.

Great fit

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

Not complete for 2002 Expedition

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

NOTBAD

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

By Omar on December 14, 2015 Verified purchase

Works perfectly

Must have to connect OEM plugs. Converts most wires from stock radio to new to radio.