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Metra 71-021C Speaker Wiring Harnesses

For select 1969-87 vehicles

4 Reviews

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Item # 12071021

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These harnesses will allow you to plug your new speakers into the factory connectors present in the speaker openings for your vehicle.

These harnesses will allow you to plug your new speakers into the factory connectors present in the speaker openings for your vehicle.

Note: Some aftermarket speakers have terminals that are wider than this harness's slide-on connectors. You may need to widen the harness's female slide-on connectors, or use the slide terminals that may be included with the speakers. If you need to connect your new speaker's connectors to the Crutchfield harness, soldering is best, and crimping is also very popular - see "Accessories."

Includes Crutchfield's 60-Day Total Satisfaction Guarantee

Note: Most vehicles will require additional installation parts — please identify your vehicle if you haven’t done so. You can also call an Advisor for more information.

What's in the Box:

  • 2 Speaker harnesses

Metra 71-021C Speaker Wiring Harnesses Reviews

Average Customer Review(s):

(4 Reviews)


Doug from Winthrop, WA on 7/11/2016

1976 Ford F Series
Crutchfield Customer Review (What's this?)

Perfect fit



Ford Mustang Speaker Adapters

Happy Classic Mustang Owner from Geneva, Oh on 11/18/2013

Crutchfield Customer Review (What's this?)

Perfect fit on my classic car, even though these do not show up in vehicle listing! Definitely worth having them sent out! These made the Retro-Sound 4x8's I bought here at Crutchfield, wire directly into the factory door wiring!


Cons: NONE!

speaker harness supplied

allen h from valle vista, ca on 4/24/2012

1980 Ford F Series
Crutchfield Customer Review (What's this?)

didnt need these



Not correct

JJ from Montana on 12/12/2011

1979 Ford Bronco
Crutchfield Customer Review (What's this?)

I was surprised these were offered for such an old vehicle, but unfortunately they did not work. I was able to splice my speakers into the original harness. They were free with the speaker purchase so no big deal.

Pros: I really liked the idea of being able to plug and play my speakers.

Cons: These do not plug into the factory door harness plug on a 79 Ford Truck/Bronco. The factory plugs are similar but larger.


Hands-on research

Product Research


Speaker Harness: These speaker harnesses prevent you from having to cut your vehicle's factory speaker plugs when replacing your factory speakers with aftermarket car speakers. The speaker harness features two female quick-slide connectors on one end to attach directly to your new aftermarket car speakers & a proprietary Molex connector on the other end that connects to your vehicle's factory speaker plug.

Quick-Slide Connectors: The speaker harness is equipped with a large (positive) & small (negative) female quick-slide terminal. These quick-slide terminals fit directly onto most aftermarket car stereo speaker terminals (slight crimping may be required). In rare cases that the quick-slide terminals do not fit your car speaker terminals, you will need to solder the speaker harness to your aftermarket speaker's terminals or replace the quick-slide connectors on the speaker harness with the correct size terminal.

Note: Installation tools, hardware, & accessories are not included & sold separately. Please see the Accessories tab for recommendations & availability.

Quick-Slide Terminal Measurements: The positive female quick-slide terminal measures 0.205" (inner width), while the negative female quick-slide terminal measures 0.115" (inner width).

Wire Code Chart: Two identical speaker harnesses are included.

Wire ColorFunction

Our Product Research Team

At Crutchfield, you'll get detailed, accurate information that's hard to find elsewhere. That's because we have our own in-house Product Research team. They verify what’s in the box, check the owner's manual, and record dimensions, features and specs. We stay on top of new products and technologies to help people make informed choices.

Q & A

Customer Q&A

Crutchfield asked  
Why did you buy this?

Converted factory wires in door to aftermarket connectors. Quick and easy hook up.[ Daniel  Nov 14, 2016 ]
It was free[ Robert  Oct 20, 2016 ]
Always use new wiring whenever possible.[ JOE  Aug 28, 2016 ]
made install a snap!![ wren  Jan 26, 2016 ]

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