Cb 125 wiring question.

I

InkandIron

New Member
I have a 1975 cb125, I'm cleaning up some of the wiring and noticed a few wires that I have questions on. I popped open the headlight and of course there is a rats nest of wiring.

First question, there is a green wire grounded to the side of the inside of the headlight with no home. Where does this get "plugged in"? Or doesn't it? The bike runs, or did before I started this project, I just don't know, if when I pulled the headlight open if this wire detached?

Second question, back on the battery it looks like one green wire is connected to the negative post, and on the other post it is two wires, one red and one red with a white stripe spliced together at the terminal connector. Is this correct? The bike runs, but I question it, because the previous owner said there was no battery charging system on these bikes, but maybe he just has it hooked up wrong?

I tried to look at a wiring diagram but they don't provide wiring colors. Somebody help! I'm retarded when it comes to this stuff.

Thanks in advance for any reply! -jake


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Using one of the stickies I did find out the battery hook up seems to be correct, green (in the headlight) looks like a ground for the horn, but do I just connect it to the other green wires floating around in there?


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1) Get (or make) a color wiring diagram for your bike or at least one you can read well. Google is your friend.
2) Get a multimeter that (at a minimum) measures continuity and DC voltage.

If the green wire in question is a ground for the horn then ground it. If the "other green wires floating around in there" are grounds, then yes, you can connect it to one of those.

-Deek
 
Yup. Ground is ground is ground. All/any the green wires all do the same thing and end up at the same place.
 
Thanks for the replies. As I continue to sort this out, there is also a few wires in the back of the headlight unaccounted for... I replaced the bars, and therefore unplugged everything to snake them through the new bars. The only one not accounted for is an white wire with a yellow stripe... Couldn't even find that in the sticky thread. Any help would be great! Thanks!


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After further review, there is a white wire with a yellow female connector coming from the main harness, and then the white wire with yellow stripe is coming from one of the clusters in the handle bars. Do these possibly get connected together? Or leave them unconnected? There aren't many options as all the other wires are accounted for.

Also I should mention, the bike is pretty well torn down, and I'm in the middle of building a box to hide battery and such, so I have no juice at the moment to test what is what . I'm just trying to button back up the headlight after a bar change


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ILoveThumpers said:
White wire in the headlight bucket with a female connector is probably your low beam hot wire.

-Deek
Click to expand...

Thanks for the input, I actually believe that the two wires, coming from the headlight have (blue and white) have the female ends, and I have the corresponding male ends coming from the harness cluster of wires. This is from the opposite direction. Directly from the main harness, white, with bright yellow rubber boot over the female end. Any ideas? Thanks!


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Do you have a wiring diagram for your bike? I did a quick Google search and came up with about a dozen.

-Deek
 
ILoveThumpers said:
Do you have a wiring diagram for your bike? I did a quick Google search and came up with about a dozen.

-Deek
Click to expand...

I'll be the first to admit I'm completely inept when it comes to looking at diagrams. Show me the parts on the bike visually and I will know exactly how it works, show me flat on a piece of paper and it's all Greek. Allthough after taking your advice and looking through a diagram I think I can manage. If I take the time to wrap my head around it, it all seems a touch less intimidating. Thanks for the replies and guidance!


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