The following is a diagram of a typical car stereo head unit wiring harness. The wire colors of the respective functions listed are common throughout the industry and found on most, if not all current name brand head units.

Typical Head Unit Wire Harness
Function	Typical Wire Colors
Memory / Constant 12V(+)	Yellow
Switch / Accessory	Red
Ground	Black
Illumination	Orange/White
Antenna Remote	Blue
Amp Remote	Blue/White
Left Front (+)	White
Left Front (-)	White/Black
Right Front (+)	Grey
Right Front (-)	Grey/Black
Left Rear (+)	Green
Left Rear (-)	Green/Black
Right Rear (+)	Violet
Right Rear (-)	Violet/Black

Car Audio:
• Glossary of Terms
• Ohm's Law
• Passive Crossovers & Calculators
• Metra Application Guides
• Power and Ground Cable Sizes
• Subwoofer Enclosures & Calculators
• Subwoofer Wiring
• the12volt's Application Guide
• the12volt's Install Bay (forums)
• Thiele - Small Parameters
• Tools & Equipment

Car Audio Wiring and Relay Diagrams:
• American Wire Gauge Sizes
• Connecting Additional Devices to Remote Turn Lead
• Power and Ground Cable Sizes
• Radio On Until Door Opened
• Stereo to Bridged Mono Switched Outputs
• Subwoofer Wiring Wizard for SVC and DVC Speakers
• Switching from Series to Parallel and Back
• Switching from Stereo to Bridged Mono & Series to Parallel
• Typical Head Unit Wire Harness

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