I ran across this the other day, and thought it might be useful to share with other AC owners. It comes in handy when troubleshooting a problem, or for wiring in that new heated shield you got for Christmas (oops, I wasn't supposed to tell you about that yet...)
SEG, you might want to make this sticky...
Wire Color Code and Function Description
NOTE: The following wire color code and function description will assist in using the Main Harness and Hood Harness wiring diagrams in this section. Note that some colors are numbered. When a numbered color appears on either of the wiring diagrams, refer to this color code description page, and it will provide you with additional information.
COLOR FUNCTION - DESCRIPTION
Brown Electrical Common; Chassis Ground
The brown wire is connected to the chassis at the engine stator plate and also through the voltage regulator chassis bolt (prior to 1989, the taillight harness also had a chassis connection). The headlight bracket is grounded on some models to reduce the bracket RFI emissions. All brown wires are common ground.
Yellow AC Power; 13 Volts AC (Alternating Current)
The yellow wire is connected to the engine stator plate lighting coil and the voltage regulator. The voltage produced by the lighting coil is very engine RPM dependent. The voltage regulator is necessary to maintain 13.5 VAC on the yellow wire whenever the engine exceeds about 3000 RPM. All yellow wires are 13 VAC. The signal on the yellow wire is AC. Not only is the voltage level of this signal RPM dependent, but the signal frequency (cycles per second) is RPM dependent as well. The electric tachometer uses this changing frequency phenomenon to indicate the engine RPM. An electric tachometer will operate properly when connected to any yellow (13 VAC) and brown (common ground) wire pair.
White Headlight Low Beam
The white wire connects the dimmer switch to the headlight bulb. The low beam filament will illuminate when the dimmer switch connects the white wire to 13 VAC power.
Blue Headlight High Beam and Indicator Light
The blue wire connects the dimmer switch to the headlight bulb. The high beam will illuminate when the dimmer switch connects the blue wire to 13 VAC power. Some models use a tachometer with a high beam indicator light. The high beam indicator light will also illuminate when the dimmer switch connects the blue wire to 13 VAC power.
Green Handlebar Warmer Indicator Light
Some models use a tachometer with a handlebar warmer indicator light. The green wire connects the handlebar warmer switch to the "warmer" indicator light. The "warmer" light will illuminate when the handlebar warmer switch connects the green wire to common ground.
Violet or Black (NOI) Ignition System "Shut-Off"
The violet or black wire connects the ignition system CDI module to the throttle control switches. Ignition spark is interrupted when any of the switches close, connecting the violet or black wire to a common ground.
Black/Red Ignition System "Shut-Off"
The black/red wire connects the throttle control switches to the ignition switch. "Spark" occurs when the black/red is at a common ground level and "spark" stops when the black/red wire is open (not connected to common ground).
Red/White #1 High Temperature Warning Light
Some models use a speedometer with a high temperature warning light. The red/white #1 wire connects the high temperature sensor to the temperature warning light. The "temp" light will illuminate when the sensor connects the red/white #1 wire to common ground.
Red/White #2 Solenoid Coil Power
The red/white #2 wire connects the ignition switch (12 volt DC) power to the solenoid. The solenoid will activate when the ignition switch connects the red/white #2 wire to the + 12 VDC battery power.
Red #1 Brakelight
The red #1 wire connects the brake control assembly switch to the brakelight filament. The brakelight will illuminate when the brake switch connects the red #1 wire to 13 VAC power.
Red #2 Electric Start Battery Power; 12 Volts DC (Direct Current)
The red #2 wire connects the battery positive post (+12 VDC) to the ignition switch through the fuse holder. All electric start red #2 wires are +12 VDC. If the fuse "blows," all red #2 wires are disconnected from the battery and battery charging (via the charging diode) discontinues until the fuse is replaced.
Red #3 Low Oil Warning Light
The red #3 wire connects the low oil sensor to the "oil" warning light. The "oil" light will illuminate when the sensor connects the red #3 wire to 13 VAC power.
Gray Electric Fuel Level Gauge
Some models are equipped with an electric fuel level gauge. The gray wire connects the in-tank resistive sensor to the gauge. As the fuel level rises, the sensor resistance decreases, and the gauge needle rises; conversely, as the fuel level goes down, the sensor resistance increases, and the gauge needle drops.
Orange Reverse Alarm
Some models are equipped with a reverse gear and reverse alarm. The orange wire connects the reverse switch to the reverse alarm. The reverse alarm will "beep" when the switch connects the orange wire to 13 VAC power.
Linear Mode
