Topic: Rear Light Question

[.RJ]

Putting together the wiring on my CB750 K1 - I've got a few wiring diagrams but for reference I'll post this one up:

http://boostrot.net/gallery/d/8976-1/cb750k1.jpg

When I turn the ignition to position 2, the running light comes on (brake light wont come on) but on position 1 the running light wont light up, although the brake light works.  According to the wiring diagram, the brown wire should run from the ign switch to the rear light, and it does - however it also runs to the front of the bike into the cluster of connectors that fits in the headlight bucket and this is something that doesnt match up on any of the wiring diagrams I have (haynes, clymer, etc).  The K6 diagram I have shows the brown wire from the ign switch going through a fuse box (this bike doesnt have one) and back to the front of the bike with no connection.  Everything else seems to work as it should - 12V to starter, coils, etc with the key on position 1.

Is it possible there's a fault inside the switch?  I have another switch, although the plug is different (square) but I could swap the plugs in a few minutes.

Thanks

[Bodi]

In position 2 ("P") the tail light brown wire is connected directly to +12V battery power  from the red wire. That's the "parking light" setting. Some countries also got a front parking light, just a dim bulb inside the headlight unit... that's what the brown wire in the shell is for.
Position 1 is more confusing.
In position 1 ("IGN") the tail light brown (TL1?) wire connects to the brown and white (TL2?) wire - this should come from the headlight switch in the handlebar pod. If there has been some fiddling with the wiring harness or the switch pods you may not have all the wiring - different markets had headlight on/off switches or didn't (daytime headlight laws), and some models with no "off" switches added a "magic" wire in the pod cable with a brown/white wire spliced to a black wire and just looped back out. Whatever, you need +12V present on that brown/white wire at the ignition switch when in position 1 to power the tail light. If there's no such colour wire in your H/L switch pod cable, just jumper the brown/white wire in the main harness (at the point where the pod wires connect) to the black wire in the same harness wire end cluster.
[rant] Once again: Clymer/Haynes colour "simplified" wiring diagrams suck. This odd circuit is pretty easy to see on the genuine Honda wiring diagram, either the magnifier-required tiny one in the owner's booklet or the larger one in the service manual. [/rant]

[.RJ]

you need +12V present on that brown/white wire at the ignition switch when in position 1 to power the tail light.

Right now there's no power to the brown/white wire as I havent wired in a headlight switch yet so that explains a lot   Thanks!

This odd circuit is pretty easy to see on the genuine Honda wiring diagram, either the magnifier-required tiny one in the owner's booklet or the larger one in the service manual. [/rant]

Does anyone have one of these on the web?  I would love to have that... I am currently using 4 different wiring diagrams supposedly for a K1 and they are all different.