How to Easily Identify Aftermarket Car Stereo Wire Colors

Norvan Martin
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Installing or replacing a car stereo system can be dauntingly complex when it comes to wiring. While at first, it might look confusing and disorienting, understanding the color coding of the various wires will certainly make things clearer. 

Firstly, it is important to realize that not all cars share the same wiring color code; even within a specific make, they may differ slightly in some aspects. 

However, generally, 

  • The white wires go to the left front speaker (LF)
  • The purple wires go to the right rear speaker (RR)
  • The green wires go to the left rear speaker (LR)
  • The yellow wire provides constant power
  • The red wire provides power when the car turns on
  • The black wire is the ground wire w
  • The blue wire serves as the power antenna or amplifier remote turn-on wire

For all other wire color matchings, check the chart below:

Headunit wire harnes including remote wire

Therefore, it is always advised that a check be conducted of your car stereo wiring diagram for that specific make and model before beginning this task.

Car stereo wiring diagram

What we are presenting here are the general color codes that exist as these should suffice in most instances.

Explanation Of Different Wire Colors

The following are the most common car stereo wiring colors and their corresponding connections:

  • Yellow Wire

This wire connects with a constant power source that supplies constant electricity to a car stereo system even after power has been turned off, such as its battery or generator.

Car stereo yellow power wire Car stereo yellow wire

This provides power even after turning the car off. The yellow wire connects directly with its positive terminal.

  • Red Wire

This wire connects directly to the ignition switch, and supplies power for car stereo systems when turned on.

Car stereo red power wire Car stereo red wire

Usually associated with a positive terminal, its function may differ – in such instances red wire could provide power directly or via another method such as USB connection.

  • Black Wire 

This wire serves as the ground wire, connected directly to your vehicle’s metal chassis.

Car stereo black power wire Car stereo black wire

The ground serves as a return route for current flow ensuring the proper function of car stereo systems.

  • Blue Wire

The blue wire is the remote on wire or antenna remote wire. When your car stereo system turns on, this wire connects directly to either a power antenna or amplifier’s remote turn-on wire for activating both devices simultaneously. To understand how the remote wire is wired, check this article.

Car stereo blue wire

Car stereo blue wires 

As soon as power is supplied through this connection, the antenna or amplifier turns itself on automatically.

  • White Wire and Black with White Stripes

This wire is often connected to the left front speaker; white indicates positive voltage in this instance.

Car stereo white wire

white wire with black stripes 

There is also black wire with white stripes. This is used for the right-front speaker.

  • Grey Wire and Grey/Black Wire

This wire usually connects the right front speaker; its gray wire represents its positive wire.  

Car stereo grey wire

The grey/black wire connects the right front speaker and is a negative wire.

  • Green Wire and Green/Black

Green wire typically connects the left rear speakers. In this instance, the green wire serves as its positive lead wire.

Car stereo green wire

The green/black wire on the other hand connects the left rear speaker.

  • Purple Wire and Violet/Black Wire

Purple wires can also be found attached directly to speakers for maximum sound output and efficiency.

Car stereo purple and violet wires

This wire usually connects the right rear speaker; its purple wire serves as its positive wire.

The violet/black wire is used for the right rear negative wire.

Note that car stereo systems may include additional wires with different colors that serve additional purposes like steering wheel controls or aux inputs. To understand their functions properly it’s crucial to refer back to their wiring diagram and check on which part each wire serves.

Explanation Of Connections

After discussing the various colors and connections for car stereo wires, let us now go over their installation process.

Connecting a car stereo system depends on its make and model as well as on any additional elements such as speakers. Below are general steps for connecting one:

Step 1: Power Connection 

Proper power distribution is vital to ensure the proper function of any car stereo system. To supply enough electricity to the stereo, its red wire must connect with either its battery or fuse box – typically via a wiring harness adapter which makes this connection simpler without cutting wires!

Step 2: Ground Connection 

A ground connection is as essential to an audio system’s proper function as its power connection.

To complete its circuit and ensure noise-free audio signals, its black wire must be securely fastened to any metal surface on your car’s chassis to complete its connection and establish an adequate base grounding connection for stereo system components.

This arrangement ensures there will be no interference or disturbance to audio signals transmitted over car stereo speakers.

Step 3: Speaker Connections 

Connecting speaker wires from a stereo system to the wires found in a car wiring harness involves linking white, gray, and purple speaker wires from your stereo to their respective wires in its wiring harness – typically, front speakers use white/gray while rear use green/purple wires – accordingly.

Correct connections ensure speakers are in phase with one another to produce optimal audio sound quality while matching impedance requirements between the amplifier or head unit and speakers.

This can prevent potential damage to either party involved in the chain reaction causing potential harm to either party involved.

Step 4: Remote Connection 

The blue wire is a remote connection that connects the head unit of your stereo system to an amplifier or other device you wish to be controlled from, such as speakers.

Having such an arrangement enables you to turn on or off either device whenever your stereo turns on/off; especially useful if using separate amplifiers to power speakers as you can use this method for volume management as well as controlling other settings directly through it.

Step 5: Memory Connection 

For added convenience and easier listening experiences, a memory connection entails connecting the yellow wire from the stereo system’s stereo component directly to an uninterrupted power source, such as your car battery.

This enables it to save all its settings – such as radio presets and equalizer settings – even after power has been shut off; saving these ensures they will always remain available when listening back again later without having to set everything back up from scratch again!

Ensuring all connections are secure is of the utmost importance and that wires are correctly connected to their terminals; incorrect connection could result in damage to either your car stereo system or electrical system.


Understanding car stereo wiring and its various colors of wires is critical when installing or upgrading a car stereo system. Yellow wire provides constant power while red provides power when the car turns on; black is ground wire while blue serves as power antenna or amplifier remote turn-on wire; finally, white gray green, and purple wires connect left/right front/rear speakers respectively.

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Norvan Martin is the founder of He is a professional Electronics Engineer and is passionate about home theater systems and AV electronics. BoomSpeaker was created as an online hub to share his knowledge and experiences as it relates to home theaters and home audio electronics. My email: [email protected]  Connect on Pinterest and Linkedin