Name: Metra 70-7901 Receiver Wiring Harness
Brand: Metra
SKU: 120707901
Price: 12.99 USD
Availability: InStock
Rating: 4.5 (118 reviews)

Metra 70-7901 Receiver Wiring Harness

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

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Metra 70-7901 Receiver 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 this 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.

Connections:

Note: You'll need to make a ground connection between your new receiver and your car's metal chassis.

12V constant power
12V switched power
power antenna turn-on
factory amp turn-on
dimmer
left front speaker +/-
right front speaker +/-
left rear speaker +/-
right rear speaker +/-

READ LESS

What's in the box:

Metra 70-7901 Receiver Wiring Harness owner's manual

7" Power/front-speaker harness
6.5" Rear speaker harness

MFR #70-7901

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Researched by Crutchfield's Stacey B.

Product Research

Features

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:

(Power/Front Speaker Harness)

Wire Color	Function
Red	+12 Volt Accessory
Yellow	+12 Volt Constant
Blue	Power Antenna
Blue/White	Amp Turn-On
Orange	Illuimination
Empty	(none)
White	Left Front Speaker +
White/Black	Left Front Speaker -
Gray	Right Front Speaker +
Gray/Black	Right Front Speaker -

(Rear Speaker Harness)

Wire Color	Function
Green	Left Rear Speaker +
Green/Black	Left Rear Speaker -
Violet	Right Rear Speaker +
Violet/Black	Right Rear Speaker -

No Ground Wire: This harness does not contain a ground wire. You will need to ground your aftermarket head unit directly to the vehicle's metal chassis.

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3 questions already asked

What wire needs to be used to power up the headrest speaker controls?

scott Mar 08, 2022

2 answers

I found that information by searching "Miata Z-74 Audio System wiring" on google and than click on images.

richard Mar 08, 2022

Copy and past the below text into notepad than resize the window until the lines align. 1 . M I A T A 2 H E A D R E S T S P E A K E R 3 P A R A L L E L AND S E R I E S 4 W I R I N G 5 6 =============================================================== 7 P A R A L L E L W I R E D 8 H E A D R E S T S P E A K E R S 9 10 PASSENGER SEAT SPEAKERS DRIVER SEAT SPEAKERS 11 (+)R(-) (+)L(-) (+)R(-) (+)L(-) 12 o o o o o o o o 13 | | | | | | | | 14 | | | | | | | | 15 | | | | | | | | 16 | | | | | | | | 17 | |_ | | | | _| | 18 | | | |_____________________|___|_____|_ | 19 | | |_________________________|___|_ | | | 20 | | | | | | | | 21 | _|_______________________________| | | | | | 22 | | | _______________________________| | | | | 23 | | | | | | | | 24 \ / \ / \ / \ / 25 ___o_____o_____________________________________o_____o___ 26 | (+) R (-) (+) L (-) | 27 | | 28 | Head Unit | 29 | Headrest Speaker Outputs | 30 |_________________________________________________________| 31 32 33 =============================================================== 34 S E R I E S W I R E D 35 H E A D R E S T S P E A K E R S 36 37 PASSENGER SEAT SPEAKERS DRIVER SEAT SPEAKERS 38 (+)R(-) (+)L(-) (+)R(-) (+)L(-) 39 o o o o o o o o 40 | | | | | | | | 41 | | | | | | | | 42 | | | | | | | | 43 | | | | | | | | 44 | | | | | | | | 45 | | | |_____________________|___|___ | | 46 | | |_________________________|___|_ | | | 47 | | | | | | | | 48 | | _____________________________| | | | | | 49 | | | _______________________________| | | | | 50 | \ / | | \ / | 51 \ x / \ x / 52 ___o_____o_____________________________________o_____o___ 53 | (+) R (-) (+) L (-) | 54 | | 55 | Head Unit | 56 | Headrest Speaker Outputs | 58 61 LEGEND: 62 L = Left 63 R = Right 64 o = Connection Point 65 (+) = Positive Terminal 66 (-) = Negative Terminal 67 x = Wire Splice (suggested point for ease of installation and,

richard Mar 08, 2022

What gauge are the wires?

jason Jun 09, 2019

1 answer

They do not list the gauge of the wire used. It is more than enough for the application in a vehicle's electrical system. I'f I had to take a guess, I'd say between 16 and 20 gauge.

thomas Jun 20, 2019 (Staff)

What is the relay in the easy connection for on a 2003 Ford escort?

dennis Apr 28, 2017

1 answer

For specific wiring/installation questions, you would be better served contacting an Advisor directly by phone (1-800-324-9695) or online chat. They can offer more detailed information to help better answer your questions.

david May 02, 2017 (Staff)

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