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Metra 70-2550 Receiver Wiring Harness Connect a new car stereo in select 1979-83 Mercedes vehicles

Item # 120702550

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

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

Item # 120702550

Shop all Metra Wiring Harnesses

About the Metra 70-2550 Receiver Wiring Harness

Metra 70-2550 Receiver Wiring Harness

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

Metra 70-2550 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 makes installing your new stereo easier, and allows you to put the factory radio back when you sell your vehicle or return it at the end of the lease. 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:

Notes: The 12V constant power lead may not be present in your car. If not, and your receiver requires a constant 12V memory lead (most do), run a wire directly to the battery or an appropriate un-switched fuse. To connect the power and ground connection plug, you'll disconnect the cigarette lighter, plug one end of the Crutchfield harness into the lighter, and the other end into the vehicle's harness. If your vehicle has a power antenna, you'll need to connect the new receiver's antenna turn-on lead to the female spade connector in your vehicle. This connector will be on the end of a blue wire which may be covered with black tubing.

  • 12V switched power
  • chassis ground
  • left front speaker +/-
  • right front speaker +/-
  • left rear speaker +/-
  • right rear speaker +/-
READ LESS

What's in the box:

  • 7" Power harness
  • Four 7" Speaker harnesses
  • Instructions
MFR #70-2550C

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More details on the Metra 70-2550 Receiver Wiring Harness

Stacey B.

Product Research

Features

Crutchfield Wiring Harness: Crutchfield 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 Crutchfield 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 Crutchfield 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 Crutchfield 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 Harness)

Wire Color Function
Red +12 Volt Accessory
Black Ground

(4 Individual Speaker Harnesses - Left Front, Right Front, Left Rear, Right Rear )      

Wire Color Function
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 -

No Constant Power Wire: This harness does not contain a 12V constant power wire and The 12V constant power lead may not be present in your car. If not, and your receiver requires a constant 12V memory lead (most do), run a wire directly to the battery or an appropriate un-switched fuse. To connect the power and ground connection plug, you'll disconnect the cigarette lighter, plug one end of the Crutchfield harness into the lighter, and the other end into the vehicle's harness.

Power Antenna: If your vehicle has a power antenna, you'll need to connect the new receiver's antenna turn-on lead to the female spade connector in your vehicle. This connector will be on the end of a blue wire which may be covered with black tubing.

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

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