Taillight troubles

[Heartbreak kid]

I recently purchased this taillight:

http://www.dimecitycycles.com/vintage-cafe-racer-caferacer-bobber-brat-chopper-custom-motorcycle-electronic-lighting-parts-classic-retro-satin-black-taillight-62-21512-sbpc.html

I figured it would be fairly easy to install but im having trouble.

I connected. The three male ends (red, black and yellow) to my yamaha (blue black and yellow.)

The brake light will come on when the lights are off. But if I swich them off it doesnt get any brighter ( although there looks to be a very faint flicker)

I have tried alternate combinations of wires and I can plug the old taillight in and it works fine. I thought maybe the bulb wasnt dual filament but I called the place I bought it from and they told me it was (hence the three wires)

What am I missing?

 

[teazer]

Ask them which leads go where or use a small battery and connect it to different combinations of leads until yyou work out which is which. I suspect that black is ground (negative) and the others are brake light and rear lamp. Try that and see what comes on when you connect red to + on the battery or the Blue to + when teh black is connected to -ve.

Next check your wiring diagram and see which lead does which. There's a high probability that the color combo is different.

I think the Yamaha wiring is
Black = Ground
Yellow = Brake light
Blue = rear lamp

 

[crazypj]

I fitted one of those to Bdn's bike a week ago (just before Dime City grand opening)
Black is ground, forget which was which on the other two.
The bullet connectors may be smaller than the Yamaha bullets so don't make a good contact (I think they are 3.5m instead of 4mm)
Remove lens and check bulb is:-
a. fitted right
b. has both filaments intact
It ain't rocket science to swap wires over with sidelights on and see which filament is the brightest, or, with lights off, step on brake