Aftermarket tail light wiring cb125

I

InkandIron

New Member
Hey all I have a 1975 cb125, I bought a aftermarket 6v tail light for it. The aftermarket light had two wires coming from it... Green and black. The stocker had three wires. Green (ground) green and yellow (brake light) and brown (based on the diagram I can't really see what this does). I'm sure Im missing something and it's fairly simple but how should I wire this? The stock lamp had a small bracket on the outside of the light that the green wire grounded to.

Any help would be much appreciated! Thanks!


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The new tail-light you bought isn't a dual-filament type, which means it has only one level of brightness. You'll either need to have a separate brake light or buy a different tail-light suitable for being used as both.
 
Aftermarket tail light wiring cb125

I'll have to investigate further, but it's the kind that illuminates "stop" when you hit the brake. I believe it has two bulbs in it, but only two wires as stated before. You can find them on eBay and what not... Is this thing useable or will I be forced to replace it?


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And just to be clear, since I'm really horrible with this, just ground that wire to the frame, and not connect it in any fashion to the tail light, and use the other two wires? Thanks for the help!


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No, I meant the light being ground to frame through the bolts, the ground wire coming from the wiring tree isn't necessary in that case. But I only found that light with three wires coming out of it:


http://www.ebay.com/itm/321398845857


[font=verdana, arial, helvetica, sans-serif]Do you have a link to the one you bought?[/font]
 
Here's the link. The light you linked to is great, but it only works on a 12v system. Mine has to be 6v. Let me know your thoughts! http://www.ebay.com/itm/390498210867

Thanks!




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My guess is that the bottom light, which illuminates the license plate and running tail light is hooked up to the brown wire. The top light would be hooked up to the green/y light controlled by the brake switches. So the "stop" illuminates when pressed... But that still doesn't explain the ground.


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6V electrics suck and you should really consider changing to a 12V system... But that's another discussion altogether.

For your tail light, the body of the tail light housing (black part) is probably the ground. Grab a multimeter and set it to the short checking mode (beeps when there's a connection between two points, and the symbol looks like a diode). Put one end on some exposed metal of the housing and another on one of the wires. If it beeps, check for the same on the other wire.

If both beep then your housing is ground and all you'll have to do is attach the ground wire to the housing and wire the lights correctly (brake to brake light, and running to running light).

On the CB125S the green wire should be ground, brown should be the running light, and green/yellow the brake light.
 
nrcb125 said:
6V electrics suck and you should really consider changing to a 12V system... But that's another discussion altogether.

For your tail light, the body of the tail light housing (black part) is probably the ground. Grab a multimeter and set it to the short checking mode (beeps when there's a connection between two points, and the symbol looks like a diode). Put one end on some exposed metal of the housing and another on one of the wires. If it beeps, check for the same on the other wire.

If both beep then your housing is ground and all you'll have to do is attach the ground wire to the housing and wire the lights correctly (brake to brake light, and running to running light).

On the CB125S the green wire should be ground, brown should be the running light, and green/yellow the brake light.
Click to expand...

If I took off the lens and visually inspected the lights internals, would I be able to tell how it is grounded? What would I look for? If not, I can buy a multimeter (probably a good idea anyways) and tackle it that way!


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Hook up power to each of the wires in turn and see if it lights up both times. If it does, it grounds through the case.
 
Sonreir said:
Hook up power to each of the wires in turn and see if it lights up both times. If it does, it grounds through the case.
Click to expand...

Making sure to ground the light housing to the neg terminal on the battery.
 
nrcb125 said:
...Put one end on some exposed metal of the housing and another on one of the wires. If it beeps, check for the same on the other wire...
Click to expand...

Note: This only works if the bulbs are installed. With the bulbs out you won't get continuity.

-Deek

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