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 |
![](graphics/yamaha/wiring/wire_black.gif) |
RED |
BATTERY POSITIVE;
SW3 Oil warning red light V4 |
![](graphics/yamaha/wiring/wire_red.gif) |
YELLOW |
Ignition ON 12-volts; Four-stroke lighting coil |
![](graphics/yamaha/wiring/wire_yellow.gif) |
BLUE |
Instrument lights, choke, choke circuit,
Ground potential oil transfer, High speed Charge Coil
|
![](graphics/yamaha/wiring/wire_blue.gif) |
GREEN |
Tachometer signal, lighting coil lead, knock sensor |
![](graphics/yamaha/wiring/wire_green.gif) |
ORANGE |
Trim position sensor |
![](graphics/yamaha/wiring/wire_orange.gif) |
PINK |
Oil and overheat signal ground |
![](graphics/yamaha/wiring/wire_pink.gif) |
WHITE |
Ignition stop circuit, SW1 oil transfer off position V4 |
![](graphics/yamaha/wiring/wire_white.gif) |
BROWN |
Start circuit Low speed charge coil; Positive "+" potential
to oil transfer pump; SW2 transfer on position V4
|
![](graphics/yamaha/wiring/wire_brown.gif) |
GRAY |
Warning circuit lead; Over-rev control;
Four-stroke tachometer |
![](graphics/yamaha/wiring/wire_gray.gif) |
SKY BLUE |
Trim Up |
![](graphics/yamaha/wiring/wire_skyblue.gif) |
LIGHT GREEN |
Trim Down |
![](graphics/yamaha/wiring/wire_lightgreen.gif) |
YELLOW-RED STRIPE |
Diagnostic lead from ECU |
![](graphics/yamaha/wiring/wire_yellowred.gif) |
PURPLE |
ECU groud to enrichment solenoid V76° |
![](graphics/yamaha/wiring/wire_purple.gif) |
BLACK/YELLOW STRIPE |
Thermo sensor |
![](graphics/yamaha/wiring/wire_blackyellow.gif) |
BLACK/RED STRIPE |
Remote oil tank ground return, PBS to tachometer,
Low speed charge coil
|
![](graphics/yamaha/wiring/wire_blackred.gif) |
BLACK/WHITE STRIPE |
Ignition coil primary lead |
![](graphics/yamaha/wiring/wire_blackwhite.gif) |
GREEN/BLUE STRIPE |
Crank position sensor |
![](graphics/yamaha/wiring/wire_greenblue.gif) |
GREEN/RED STRIPE |
Red oil warning light ground through SW3 in main tank oil
sensor to tachometer
|
![](graphics/yamaha/wiring/wire_greenred.gif) |
GREEN/WHITE STRIPE |
Crank position sender; Lighting coil lead to rectifier |
![](graphics/yamaha/wiring/wire_greenwhite.gif) |
BLUE/GREEN STRIPE |
Main tank oil level sensor SW2 oil transfer circuit |
![](graphics/yamaha/wiring/wire_bluegreen.gif) |
BLUE/RED STRIPE |
Main tank oil level sensor SW3. No oil warning circuit |
![](graphics/yamaha/wiring/wire_bluered.gif) |
BLUE/WHITE STRIPE |
Main tank oil level sensor SW1; Oil transfer OFF circuit |
![](graphics/yamaha/wiring/wire_bluewhite.gif) |
BLUE-YELLOW STRIPE |
Shift cut switch |
![](graphics/yamaha/wiring/wire_blueyellow.gif) |
PURPLE-RED STRIPE |
OX66 #1 injector |
![](graphics/yamaha/wiring/wire_purplered.gif) |
PURPLE/BLACK STRIPE |
OX66 #2 injector |
![](graphics/yamaha/wiring/wire_purpleblack.gif) |
PURPLE/YELLOW STRIPE |
OX66 #3 injector |
![](graphics/yamaha/wiring/wire_purpleyellow.gif) |
PURPLE/GREEN STRIPE |
OX66 #4 injector |
![](graphics/yamaha/wiring/wire_purplegreen.gif) |
PURPLE/BLUE STRIPE |
OX66 #5 injector |
![](graphics/yamaha/wiring/wire_purpleblue.gif) |
PURPLE/WHITE STRIPE |
OX66 #6 injector |
![](graphics/yamaha/wiring/wire_purplewhite.gif) |
RED/YELLOW STRIPE |
Key on power through fuel pump relay; power to ECU;
Fuel pump and fuel injectors
|
![](graphics/yamaha/wiring/wire_redyellow.gif) |
WHITE/RED STRIPE |
#1 pulser V6 |
![](graphics/yamaha/wiring/wire_whitered.gif) |
WHITE/BLACK STRIPE |
#2 pulser V6 |
![](graphics/yamaha/wiring/wire_whiteblack.gif) |
WHITE/YELLOW STRIPE |
#3 pulser V6 |
![](graphics/yamaha/wiring/wire_whiteyellow.gif) |
WHITE/GREEN STRIPE |
#4 pulser V6 |
![](graphics/yamaha/wiring/wire_whitegreen.gif) |
WHITE/BLUE STRIPE |
#5 pulser V6 |
![](graphics/yamaha/wiring/wire_whiteblue.gif) |
WHITE/BROWN STRIPE |
#6 pulser V6 |
![](graphics/yamaha/wiring/wire_whitebrown.gif) |
YELLOW/WHITE STRIPE |
Electric fuel pump for electric carb system (ECS) |
![](graphics/yamaha/wiring/wire_yellowwhite.gif) |
|