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Metra 70-7903 Receiver Wiring Harness

Connect a new car stereo in select 2001-up Mazda vehicles

Item # 120707903

This vehicle-specific wiring harness makes connections between your new car stereo and your car's electrical system.

Find what Fits your vehicle

This vehicle-specific wiring harness makes connections between your new car stereo and your car's electrical system.

California customers:
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Item # 120707903

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About the Metra 70-7903 Receiver Wiring Harness

Metra 70-7903 wiring harness

This vehicle-specific wiring harness makes connections between your new car stereo and your car's electrical system.

Metra 70-7903 wiring harness

This vehicle-specific wiring harness makes connections between your new car stereo and your car's electrical system.

First, attach the color-coded wires on your Crutchfield-supplied harness to the wires from your new stereo. If you're not using a soldering iron, we recommend that you purchase some wire connectors to secure the connections. Check out our handy article on three ways to connect the wiring harness here.

Now, once this harness is connected to your new stereo, you'll be able to plug right into your car's factory radio connector. This harness saves installation time since you won't have to cut factory wires individually, and it also enables you to re-install the factory radio if needed. A detailed instruction sheet comes with the harness. Warranty: 60 days.

Please read this important note: This harness may not contain provisions for every wire needed to complete your installation, and it will not accommodate special navigation, video, or factory steering wheel control connections. You will need a special adapter if you want your factory steering wheel audio controls to work with your new stereo.


  • 12V constant power
  • 12V switched power
  • chassis ground
  • power antenna turn-on
  • illumination
  • left front speaker +/-
  • right front speaker +/-
  • left rear speaker +/-
  • right rear speaker +/-

What's in the box:

MFR #70-7903

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More details on the Metra 70-7903 Receiver Wiring Harness

Stacey B.
The Metra 70-7903 Receiver Wiring Harness replaces these items:

Product Research


Metra Wiring Harness: Metra wiring harnesses prevent you from having to cut your vehicle's factory radio plug when replacing your factory radio with an aftermarket head unit. Simply solder or crimp the Metra wiring harness to your aftermarket head unit's harness (solder & crimps not included), plug the aftermarket head unit's plug into the rear chassis of the aftermarket head unit, and plug the Metra wiring harness into your vehicle's factory radio plug.

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

Wiring Notes: If the Metra wiring harness is not equipped with a ground wire, you will need to ground the aftermarket head unit's ground wire to the metal chassis of your vehicle. Some vehicle's may require you to bypass the vehicle's factory amplifier (in another location from factory radio) or hardwire certain connections. If your vehicle is equipped with factory steering wheel controls, an additional adapter is required & sold separately.

Wire Code Chart:

Wire Color Function
Red +12 Volt Accessory
Yellow +12 Volt Constant
Black Chassis Ground
Blue Power Antenna
Blue/white Amp Turn-On
Orange Illumination
White Left Front Speaker +
White/Black Left Front Speaker -
Gray Right Front Speaker +
Gray/Black Right Front Speaker -
Green Left Rear Speaker +
Green/Black Left Rear Speaker -
Violet Right Rear Speaker +
Violet/Black Right Rear Speaker -

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Customer Q&A

4 questions already asked

Will the Metra 70-7903 Wiring Harness fit a 2005 Mazdaspeed Miata with the Bose factory sound system?
[ EricH  Jul 11, 2020 ]
1 answer
It worked perfect for our 2004 (I also paid a few bucks more for Crutchfield to make the connections - whatever that is called) -BUT- our car isn't a turbo and we didn't have the Bose so not sure. I would THINK that the factory wiring is standard but your question may be better answered on a Miata forum. I couldn't say with certainty. Good luck!
[ CHARLES  Jul 11, 2020 ]
What pin size do I need to add wires to this? I would like to attach my steering wheel control adapter to this instead of hacking up my factory harness.
[ Anonymous  Nov 01, 2019 ]
1 answer
Hi Alex, thank you for your question. We do carry steering wheel control adapters and interfaces for most vehicles. These adapters will usually keep you from needing to cut or splice into any stock wiring. Please chat with an Advisor online or by phone at 1-800-324-9695. They will be happy to take a look at your vehicle's information, and get you setup with the proper gear for your installation.
[ Jess  Nov 08, 2019 ]  Staff
William this World ón a mazda tribute 2002 whith oem subwoofer?
[ Ricardo  Jul 16, 2019 ]
1 answer
It works on the those 2002 Tributes that came with the subwoofer and came with the radio that has the MD-TAPE button. If the stock radio does not have the MD-TAPE button, then a different harness is needed which is the 70-7901 harness found here: My Bio:
[ Paul  Jul 21, 2019 ]  Staff
Amazon says this product only fits 2001-2007 Mazdas. Will this fit a 2012?
[ Ben  Sep 14, 2015 ]
1 answer
For details on fit or installation please contact an Advisor by phone (1-800-324-9695) or online chat. They will be able to pull up your vehicle and give you the details on if this will fit and what you will need for an installation in your vehicle.
[ Krissy  Sep 14, 2015 ]  Staff

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