yellow wire?

i took the seat off and found a yellow wire that was disconnected. it was with a black and a blue wire going to the tail light. what is this one for?

Redman, I know the yellow on my WR450F is power to the headlamp and the blue goes to the rear for running light. Not sure on your bike. Do you have a shop manual for this bike? Maybe somebody with a 400 wiring diagram may be more help than me.

Without going to look, I would say it is for the brake light. Since the WR is street legal in some parts of the world the tail light is pre-wired for a brake light and already has a dual element bulb in it.

Without going to look, I would say it is for the brake light. Since the WR is street legal in some parts of the world the tail light is pre-wired for a brake light and already has a dual element bulb in it.

Yeah, I would guess it's for the brake light too. I would say that's power to your switch, which would then get wired to the other filament.

did do the WR's come from the factory street legal? i would like to make mine but i don't know what all i will need. i'll start a new post

They are sold plated in Oz, but if you have a "C" or a "3" in the 8th position on the Vin, you'll never get anything but a red sticker for the WR.

If it's a newer green-sticker WR, then you CAN get it plated with a Baja Designs kit, but if it's already been titled with a green sticker for offroad, that's no longer an option.

Only hope is to plate it in AZ.

It is for the brake light switch.

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