Wiring a new tail light

[JimmyR]

Just wondering if anyone knows which way around I should wire my new tail light. I have a beautiful new light from Japan but the instructions are entirely in Japanese so I'm not even sure that my question would be answered in them!

There are 3 wires - black, blue and green. I would guess that green would be ground, and this seems about right because because if I connect a 9V battery neg>green, pos>black or blue then the light glows. Black is brighter than blue, and when I look at the bulb you can see that the filament for the black wire is thicker. So is black for the brake or is blue?

[Deano]

By your description, it sounds like black=brake, blue=tail. My advice comes with no warranties or guarantees.

[JimmyR]

Thanks mate - yeah that's pretty much what I have worked out. I am sure that you are 100% correct!

[henrys]

Thanks mate - yeah that's pretty much what I have worked out. I am sure that you are 100% correct!

Just check that in neither case (black to + or blue to +) do both filaments light up, which could happen if your guess of green being - is wrong. And that when you put both black and blue to + at the same time they both light. I had this when I got my used bike.