CB750 Wiring Issues

[royhall]

Good morning all. This is for you budding auto electricians out there. The 750 has arrived at the wiring stage. Starting at the back and working forwards all has gone okay including non standard reg/rect and Boyer ignition. Just got to sort out the pan of spaghetti in the headlight. That's brought up the first issue. Why are there 3 cables shown on the front indicators and only 2 on the rear. The actual units just have supply and earth. I am sure I have done this loads of time before but it has me stumped this time. Cheers.


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[McCabe-Thiele (Ted)]

Is it for US style orange front marker lights?
Running light/sidelights do they call them.

[taysidedragon]

Is it for US style orange front marker lights?
Running light/sidelights do they call them.

Beat me to it Ted, only needed at the front.

[McCabe-Thiele (Ted)]

Daft thing is I only thought it was for orange marker lamps as my Boss in the car trade back in 1971 had a Ford Gran Torino - with the orange fire stripes down the side.(Remember Starsky & Hutch).
Might be wrong though?

[royhall]

Thanks chaps. I assume then that the blue/white cable can be ignored as the UK spec front indicators have no provision for that.

[Oddjob]

You can use them to run a buzzer if you like. As they did in the 70s

[royhall]

You can use them to run a buzzer if you like. As they did in the 70s

Eeeerrr no thanks.

[Oddjob]

Paint the bike gold and black, get the buzzer going and pretend to be a bloody big wasp, what's not to like? 

[royhall]

Actually joking aside, I have too many blue wires in the headlamp. But as it's a USA bike there will be one for a buzzer. Nice one.

EDIT. Scratch that the buzzer wire is brown.

[Oddjob]

Dark blue or light blue?

[royhall]

Light blue. I'm just in the process of belling them all through at the moment. Pain of a job so may take a while.

[Martin6]

Mine is a UK bike (K6). It has buzzers on the indicators. Goes for the duration on left turns, only once, then off on right.

I had thought it was a US only thing?

[Oddjob]

No UK bikes got them for a couple of years, my 550F2 has one. They were removed after concerns blind people could confuse them for the sound for the safe to cross signal for pedestrian crossing.

That's a really complicated left hand switch there Roy, first time I've seen a really good diagram of one laid out like that. It looks as though they used the Orange/White and Light Blue/White wires to run running lights through the indicators whereas we used them to run the buzzers BUT what's interesting is that the lights go out when the indicators are used to avoid any confusion, so using the left would mean the running light filament in the left bulb goes out whilst the indicator filament flashes but they right hand one stays lit. What a weird setup.

Plus why use a brown wire when there is already a brown wire in the headlight used for power to the headlights?

[royhall]

To be honest the whole lot is confusing. At the moment I am belling everything through one at a time and labelling them. This is going to be a long job so I think I will spread it over a few days. And this thread is only the first question.

[Nurse Julie]

Mine is a UK bike (K6). It has buzzers on the indicators. Goes for the duration on left turns, only once, then off on right.

I had thought it was a US only thing?

No buzzer on our UK K6 🤔🤔🤔🤔