Automotive Wire Colors and Their Function

This image shows a wire harness with different colors, each with a specific electrical purpose within the vehicle system. Here’s what each one represents! 

? Power – RED
 Carries positive current to different components of the car.
 Essential for activating systems such as ignition or electronic modules.

? Ground – BLACK
 Connects components to the vehicle’s chassis, completing the electrical circuit.
 Without this wire, there is no current return = the system does not work.

? Signals – YELLOW
 Transmits electrical impulses from sensors to the ECU (control unit).
 Important for data such as speed, position, or temperature.

? Light – WHITE
 Powers dashboard, interior, or headlight lights.
 Turns on and off at the driver’s command.

? Battery – BLUE
 Carries direct current from the battery to various systems.
 It is the main power input cable to the system.

? Lighting – BROWN
 Connects headlights, taillights, and license plate lights.
 Ensures visibility and compliance with regulations.

? Turn Signals – PURPLE
 Carries power to the turn signals.
 Very important for indicating turns and lane changes.

? Speaker – GREY
 Connects the vehicle’s sound system.
 Carries audio signal from the stereo to the speakers.

?? Fuel Pump – BLACK & WHITE
 Powers the pump that delivers gasoline to the engine.
 Without this signal, the engine does not receive fuel.

 Tech Tip:
Always check the vehicle’s electrical diagram before working on the wiring. Avoid shorts, failures, or damage to electronic modules!

 Useful for: Accessory installation, electrical fault diagnosis, audio or lighting modifications.