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Wire Color Code Chart for SAE, IEC, and MIL Standards

Reference SAE, IEC, and MIL wire color codes with swatches, abbreviations, and harness documentation context.

Society of Automotive Engineers standard for automotive primary wire

SAE J1128 (Automotive) Quick Reference

Color	Abbrev.	Description	Typical Usage
Black	BLK	Ground/chassis connections	Primary ground, chassis ground
Brown	BRN	Running lights, tail lights	Tail lamps, parking lamps
Red	RED	Primary power, battery positive	Battery feed, ignition power
Orange	ORN	Accessory power	Accessories, auxiliary power
Yellow	YEL	Left turn, hazard	Left turn signal, hazard flasher
Green	GRN	Right turn signals	Right turn signal
Blue	BLU	High beam indicator	High beam headlamps
Violet	VIO	Dimmer/courtesy	Instrument panel dimmer
Gray	GRY	Auxiliary/secondary	Various auxiliary circuits
White	WHT	Ground return, neutral	Return ground, neutral
Pink	PNK	Fuel gauge sender	Fuel level sending unit
Light Blue	LT BLU	Oil pressure sender	Oil pressure gauge
Light Green	LT GRN	Temperature sender	Engine temperature gauge
Tan	TAN	Brake warning	Brake warning system

Frequently Asked Questions

What is SAE J1128?

SAE J1128 is the Society of Automotive Engineers standard for low-voltage primary cable. It defines wire colors, sizes, and insulation requirements for automotive wiring up to 60V DC.

What is IEC 60757?

IEC 60757 is the International Electrotechnical Commission standard for color coding of conductors. It uses two-letter abbreviations (BK, BN, RD, etc.) and is widely used in European electrical systems.

How does MIL-STD-681 wire marking work?

MIL-STD-681 uses a base color plus tracer stripes to identify wires. Each color represents a digit (0-9), allowing unique identification of hundreds of wires in complex aerospace harnesses.

Why are wire color codes important?

Consistent color coding reduces wiring errors during manufacturing and maintenance, speeds up troubleshooting, and helps technicians quickly identify circuit functions.