Smart & Connected Life > Connected Car Tech 162 162 people found this article helpful How to Identify Aftermarket Car Stereo Wire Colors They typically follow a common pattern By Jeremy Laukkonen Jeremy Laukkonen Facebook Twitter Writer Shoreline Community College Jeremy Laukkonen is automotive and tech writer for numerous major trade publications. When not researching and testing computers, game consoles or smartphones, he stays up-to-date on the myriad complex systems that power battery electric vehicles . lifewire's editorial guidelines Updated on August 19, 2021 Reviewed by Christine Baker Reviewed by Christine Baker Christine Baker is a marketing consultant with experience working for a variety of clients. Her expertise includes social media, web development, and graphic design. lifewire's editorial guidelines Tweet Share Email Tweet Share Email Connected Car Tech Android Auto Apple CarPlay Navigation What to Know The 12V battery wire is yellow, the accessory wire is red, and the dimmer/illumination wire is orange with a white stripe. The right-front speaker wires are gray, left-front speakers are white, right-rear speakers are purple, and left-rear speakers are green. Ground wires are black, antenna wires are blue, and amplifier wires are blue with a white stripe. This article explains how to identify car speaker wire colors when installing a car stereo. Standard Aftermarket Car Stereo Head Unit Wire Colors The easiest way to wire in an aftermarket car stereo is to identify the OEM wires using diagrams for the specific vehicle and head unit. Still, it's possible to get the job done without any labels, adapters, or diagrams. Unlike OEM head units, which are all over the place in terms of wire colors, most aftermarket manufacturers stick to a standardized coloring scheme. Although there are exceptions to every rule, most aftermarket car stereos use a standardized coloring scheme for the power, ground, antenna, and speaker wires. Suppose you have the pigtail that came with your aftermarket head unit, and it uses the standard colors. In that case, the wires have the following purposes and colors: Power Wires Constant 12V / Memory Keep Alive: Yellow Accessory: Red Dimmer/illumination: Orange with a white stripe Ground Wires Ground: black Speakers Right front speaker(+): Gray Right front speaker(-): Gray with a black stripe Left front speaker(+): White Left front speaker(-): White with a black stripe Right rear speaker(+): Purple Right rear speaker(-): Purple with a black stripe Left rear speaker(+): Green Left rear speaker(-): Green with a black stripe Amplifier and Antenna Wires Antenna: Blue Amplifier remote turn on: Blue with a white stripe Lifewire / Nusha Ashjaee Installing a Used Car Stereo With or Without a Pigtail If you have a used car stereo that you want to install and the pigtail that came with the head unit, check the list above to see what each wire in the pigtail needs to connect to. If you don't have the pigtail, look for an adapter that's designed to connect that head unit to your make and model of car. If that doesn't work, obtain a replacement pigtail to proceed anyway. Hopefully, the colors of those wires will match up to the aftermarket standard. Otherwise, you'll need a wiring diagram, which is sometimes printed on the exterior of the head unit or available online. Using a Head Unit Harness Adapter Although most aftermarket head units follow the above coloring scheme, and it's possible to figure out what the OEM wires in your car are for without a wiring diagram, installing an aftermarket head unit is easier if you have a harness adapter. Car stereo wiring harness adapters are useful because, while aftermarket car stereos have the same inputs and outputs as the factory stereos that they're designed to replace, those inputs and outputs aren't in the same places. If you can get the correct car stereo wiring adapter, it simplifies the installation process. One end of the adapter plugs into the car stereo, the other end plugs into the wiring harness that originally connected to the factory stereo, and that's all there is to it. Why Doesn't Everyone Use Harness Adapters Instead of Splicing Wires? While harness adapters are inexpensive—and available for various car and head unit combinations—there isn't much wiggle room in terms of compatibility. For a head unit wiring harness to work, it needs to be specifically designed for both the vehicle and the new head unit. Suppose you can figure out the specific model of the head unit that you're trying to install. In that case, there are online resources that allow you to plug in that information—along with the make, model, and year of your car—to see if an adapter is available. What If a Head Unit Wiring Harness Adapter Isn't Available? If you can't figure out the specific model of a used head unit, identify the purpose of each wire and manually connect everything the right way. In that same vein, there is also a chance that an adapter isn't available for any given combination of vehicle and head unit. If that's the case, and you also don't have the pigtail that came with the head unit, either find a replacement pigtail or track down a wiring diagram and connect to the individual pins on the back of the head unit. While you can install a head unit without a wiring harness, it's more complicated than the sort of basic DIY head unit installation process that most do-it-yourselfers are comfortable with. Was this page helpful? Thanks for letting us know! Get the Latest Tech News Delivered Every Day Email Address Sign up There was an error. Please try again. You're in! Thanks for signing up. There was an error. Please try again. Thank you for signing up! Tell us why! Other Not enough details Hard to understand Submit