View source for Color of Wires and where they go

Thanks to Reg from Bristol for the following:



For the most part its quite easy really
Honda use the same colour conventions on all
their bikes.
So if you say find a green/blue wire on an 82 GL1100
you know its the cable between the temp sender and the gauge
and any green wire is ground

'for the most part'

its in the minor differences where routing and description helps
ie the supply to the flasher relay
black early CX models usually CDU ones
white/green later usually TI models GLs Eurosports etc

Without routing and descriptions/notes its of limited use
and may not achieve its intended goal of demystifying the wiring.
I'd use a format like
main colour - tracer if any - from -to

**Green:'''
from/to: various
Notes:
Ground wires on all systems, all green wires should have continuity
(ie zero or very low resistance) to each other
the frame and the battery negative terminal.

**Green/Blue'''
From: temp gauge
To: temp sender in thermostat
Notes:
can be disconnected near thermostat and the voltage read with igntion on to check
for good 7V supply if the regulator is suspect.

**Blue/Red'''
From: Oil warning light
To: Oil pressure switch on front of engine
Notes:
May also be found under ths seat on early US spec bikes with rear light failure units
aka 'stop warning unit'
Has been known to cause alarm and confusion with no oil pressure.
Often disconnected because of this.

**Black'''
From: Ignition switch
To: Various
Notes:
With ignition on, black wires supply the fuse box and various systems
and multiple wires are tapped from the main harness.

**Black/White'''
READ THIS FIRST !!
Overview:
This colour cable has two very different uses
depending on the type of ignition used
so care must be taken and the details understood to avoid damage.
Be aware the kill switches work differently between CDI/Ignitech and TI bikes.

CDI:
From CDI box or ignitech
To: Kill switch
Notes:
The kill switch (closed)shorts this to ground in order to stop the engine
In standard bikes it shorts stator source coil output to ground.
On Ignitechs it pulls a signal wire low which stops the output.

TI:
From: Kill switch
To: coils and spark units
Notes:
This cable supplies power to the ignition system from the kill switch
with the switch off(open),the supply is interrupted

**Red'''
From: Main fuse
To: Ignition switch
Notes:
Supplies power to the bikes electrical systems

**White/Green'''
From: 4 way Fuse box
To: Flasher relay, Brake lamp switches, Clutch switch, Horn switch,
Pass switch (UK models)
Notes:
used on later bikes with a 4 way fuse box to supply the above systems

**Red/White'''
From: Regulator rectifier (RR)
To: main fuse.
Notes:
carries all DC power from the RR
May terminate at the battery side terminal on the solenoid
and a red cable may be used from there to the main fuse.
Some wiring diagrams, Haynes for instance, have errors showing how
this is actually routed and connected.

**Grey'''
From: flasher relay
To: flasher selector switch on LH bars
Notes:
flasher relay may be supplied by a Black cable on early bikes or a White/green on later bikes

**Light blue'''
From: flasher selector switch on bars
To: Rh flashers front, rear and panel

**Orange'''
From: Flasher selector switch on bars
To: LH flashers front, rear and panel

**Light Blue/White'''
From: Flasher selector switch
To: RH front flasher
Notes
Front running lights on some US spec models

**Orange/White'''
From: Flasher selector switch
To: LH front flasher
Notes:
Front running lights on some US spec models

**Yellow/Red'''

From Starter button
To: Solenoid coil
Notes:
Supplies power to the solenoid coil when button pressed
the solenoid when actuated, passes power from the battery Live terminal
to the starter motor

**Dark Green/Red'''
From: Solenoid
To: Clutch switch and blocking diode
Notes:
See starter system diagram on wiki for full explanation
Briefly, the solenoid can only actuate when either the neutral switch or clutch switch is closed.
The diode is only there to prevent the neutral light glowing
when the clutch is pulled to make gear changes

[[File:starting|thumb|starting diagram with diode.jpg]]


**Light Green/Red'''
From: Neutral indicator
To: Neutral switch on rear of engine and blocking diode
Notes:
See starter system diagram on wiki for full explanation
Briefly, the solenoid can only actuate when either the neutral switch or clutch switch is closed.
The diode is only there to prevent the neutral light glowing
when the clutch is pulled to make gear changes





**Notes on running lights:'''
The Haynes manual shows some models with all black wires
at the flashers and front running lights
These may be short stubs at the light assemblies or an unclear diagram
Careful inspection advised.

Bikes with running lights have a more complex flasher
selector switch and use double filament bulbs in the front.
The power to a running light is cut when the flasher for that side is selected.
Its been known for some folk to confuse the running light
with the flasher when fault finding.

Here is the colour code as an image that you can download & print (from Sidecar Bob)
 http://www.ngwclub.com/gallery3/var/albums/wingmans/Sidecar-Bob/Honda_Wire_Color_Codes.jpg