Metra 71-021C Speaker Wiring Harnesses

For select 1969-87 vehicles

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.

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, then check here for a list of parts. You can also call an Advisor for more information.

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What's in the box?

Download owner's manual

  • 2 Speaker harnesses
  • Instructions

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Features

Crutchfield Speaker Harness: Crutchfield speaker harnesses prevent having to cut your vehicle's factory speaker wiring when replacing the factory speakers with aftermarket car speakers. Each Crutchfield speaker harness features two female quick-slide connectors on one end that attach directly to your new aftermarket car speakers, and a proprietary connector on the other end that connects to your vehicle's factory speaker plug.

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

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

Quick-Slide Terminal Measurements: The positive female quick-slide terminal measures 0.205" (inner width), while the negative female quick-slide terminal measures 0.110" (inner width).

Wire Code Chart: Two identical Crutchfield speaker harnesses are included.

Wire Color Function
White Positive
Black Negative

The Crutchfield Car Selector: Please visit the Crutchfield Car Selector for your specific type of vehicle.

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 open the box, verify contents, 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.

Metra 71-021C Speaker Wiring Harnesses Reviews

Average Customer Review:

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Ford Mustang Speaker Adapters

Written By Happy Classic Mustang Owner, Geneva, Oh on Monday, November 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!

Pros: PERFECT!

Cons: NONE!

speaker harness supplied

Written By allen h, valle vista, ca on Tuesday, April 24, 2012

Crutchfield Customer Review (What's this?)

didnt need these

Not correct

Written By JJ, Montana on Monday, December 12, 2011

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.

Get everything you’ll need to enjoy your new Metra 71-021C Speaker Wiring Harnesses

If you don't already have these in your toolbox, you may find them handy, if not indispensable.
Some speakers have non-standard connectors. Make your installation easier with connector adapters.
Metra Crimp Tool Set

Metra Crimp Tool Set

Package contains light-duty crimp tool and 20 crimp caps

Item #: 120RCVRKIT

(28)

Metra Female Quick Slides

Metra Female Quick Slides

An assortment of female quick slide connectors for connecting to speaker terminals

Item #: 120FQS10PK

(48)

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