Wiring Color Codes for YAMAHA Outboard Motors.

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WIRING COLOR CODES

Here is a listing of common color codes for Yamaha outboard motors. There is an industry-standard set of wire codes in general use by most manufacturers except Yamaha. Colors listed here may vary with year & model but in general should be a good guide when tracing Yamaha wiring troubles.

YAMAHA COMMON WIRING COLOR CODES
WIRE COLOR(S)	FUNCTION	COLOR SAMPLE
BLACK	GROUND
RED	BATTERY POSITIVE; SW3 Oil warning red light V4
YELLOW	Ignition ON 12-volts; Four-stroke lighting coil
BLUE	Instrument lights, choke, choke circuit, Ground potential oil transfer, High speed Charge Coil
GREEN	Tachometer signal, lighting coil lead, knock sensor
ORANGE	Trim position sensor
PINK	Oil and overheat signal ground
WHITE	Ignition stop circuit, SW1 oil transfer off position V4
BROWN	Start circuit Low speed charge coil; Positive "+" potential to oil transfer pump; SW2 transfer on position V4
GRAY	Warning circuit lead; Over-rev control; Four-stroke tachometer
SKY BLUE	Trim Up
LIGHT GREEN	Trim Down
YELLOW-RED STRIPE	Diagnostic lead from ECU
PURPLE	ECU groud to enrichment solenoid V76°
BLACK/YELLOW STRIPE	Thermo sensor
BLACK/RED STRIPE	Remote oil tank ground return, PBS to tachometer, Low speed charge coil
BLACK/WHITE STRIPE	Ignition coil primary lead
GREEN/BLUE STRIPE	Crank position sensor
GREEN/RED STRIPE	Red oil warning light ground through SW3 in main tank oil sensor to tachometer
GREEN/WHITE STRIPE	Crank position sender; Lighting coil lead to rectifier
BLUE/GREEN STRIPE	Main tank oil level sensor SW2 oil transfer circuit
BLUE/RED STRIPE	Main tank oil level sensor SW3. No oil warning circuit
BLUE/WHITE STRIPE	Main tank oil level sensor SW1; Oil transfer OFF circuit
BLUE-YELLOW STRIPE	Shift cut switch
PURPLE-RED STRIPE	OX66 #1 injector
PURPLE/BLACK STRIPE	OX66 #2 injector
PURPLE/YELLOW STRIPE	OX66 #3 injector
PURPLE/GREEN STRIPE	OX66 #4 injector
PURPLE/BLUE STRIPE	OX66 #5 injector
PURPLE/WHITE STRIPE	OX66 #6 injector
RED/YELLOW STRIPE	Key on power through fuel pump relay; power to ECU; Fuel pump and fuel injectors
WHITE/RED STRIPE	#1 pulser V6
WHITE/BLACK STRIPE	#2 pulser V6
WHITE/YELLOW STRIPE	#3 pulser V6
WHITE/GREEN STRIPE	#4 pulser V6
WHITE/BLUE STRIPE	#5 pulser V6
WHITE/BROWN STRIPE	#6 pulser V6
YELLOW/WHITE STRIPE	Electric fuel pump for electric carb system (ECS)

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