Topic: 1974 cb750 k4 electronics

[void909]

I'm in electronic hell right now. I have a manual but there are way more wires than in the book. I'm drawing at straws. Any suggestions? Orange wire white stripe? Green wires? HHHHEEEEELLLLPPPP

[333]

Not to be padantic (a word I learned in the "Shameless Post Boost Thread) You must mean electric hell.  While the rectifier comes close to being electronic, that's about it on a stock '74.

So, first, what manual do you have?  And what is the bike doing or not doing?

[troppo]

G`day void
OK from memory (on my 76 750f)
Orange/white stripe front indicator (cant remember the side sorry)
Green wires are earth
Light green is the horn

[void909]

Ok for the record I have never seen this bike run. As a matter of fact I have never seen a cb750 in person that was running. This bike was a basket case. Just the other night I got my ignition turn signals and battery done so I figured I would try them all out. To be honest I was banking on a fire but It didn't (thank god). I turned the key on and tried the signals and HOLY SH!T there was life! The left turn signals worked. This was awesome because I rebuilt them myself. After a little tinkering I got the rights to work and my dummy turn light worked. I plugged in the headlight but got nothing. Same goes for my speedo and tach.  I don't have a tail light yet. I have the exhausts and carbs off right now so I didn't try the starter. I guess my main question is what is supposed to turn on when I turn the key to the first notch? 

In the pics I show what wires I have left over with nowhere to be plugged.
light blue with a white stripe
brown with a blue stripe
and the two greens that attach to the headlight nuts

the infamous red wire with nowhere to go that is hot.

And my ignition bracket I made because trying to find a stock one is ridiculous

To answer your question I have a haynes manual and the diagram is not in color and it said it was for a 72 cb750 k

Troppo it seems like I dont have any female ends to plug the greens into inside the bucket.

[void909]

Well I did some more tinkering and I got my guage lights to come on but they are very dim. Is there a different bulb I could yes that may brighten them up?

[jsaab2748]

Green female connectors are generally 4 way. Two males go in the front of the connector, and two go in from the back. If that helps..

[troppo]

G`day void
The dim dash lights might be due to a low battery or dirty connections.
As to your spare wires, light blue and a white stripe is front indicator i think, brown /blue stripe is horn buzzer and the greens go to a multi connector like jsaab said.
If you dont have a multi connector then someone has cut it off and replaced it.
Not sure what the red is but i would guess its hot, check if theres a wire missing from your ignition switch.
If you want a colour wiring i have one for a 76 750f if its any help, pm me and i`ll send it to you

[void909]

Green female connectors are generally 4 way. Two males go in the front of the connector, and two go in from the back. If that helps..

The problem is I don't have any female connectors. Maybe I'm missing something. let me look again. The red wire on the side of the bike might connect to a fuse but im not sure at this point. I saw a tune up kit that included a positive battery wire and a fuse for something but im not sure what the other end hooks to.

Troppo, a color wireing diagram would be great!

[jsaab2748]

Green female connectors are generally 4 way. Two males go in the front of the connector, and two go in from the back. If that helps..

The problem is I don't have any female connectors. Maybe I'm missing something. let me look again. The red wire on the side of the bike might connect to a fuse but im not sure at this point. I saw a tune up kit that included a positive battery wire and a fuse for something but im not sure what the other end hooks to.

Troppo, a color wireing diagram would be great!

Maybe a P.O. cut em off and bypassed them. Far as I know ALL grounds for a k4 are dark green. A diagram is available in the "Technical Library" of this sight. It's in color too.

[void909]

Ok I found this pic. can anyone tell me what this fuse is for?

[troppo]

Ok I found this pic. can anyone tell me what this fuse is for?

No idea, you have a battery hold down strap, battery leads but cant help with the fuse sorry.
Email sent with the wiring stuff you wanted

[void909]

Thanks Troppo. I once again appreciate it.

Someone must know something.

[troppo]

Been thinking about it mate, could that be the fuse for an electronic ignition set up?
You got a new positive battery clamp and associated wiring, new battery strap  and fuse box with one fuse in it, obviously for some sort of aftermarket add on