Neutral light question

[bpcough]

I have built a mini-dragster powered by a hayabusa. I had to completely change the wiring system because i use a motec ecu.
I need to add a neutral light on the dash to make it legal for the drags.
It seems to me that the neutral sensor is on the clutch side of the motor. There is a red, blue and black wire running out of the sensor.
Can anyone tell me how to wire up a neutral light?
thanks
Bryan

[macon454]

bump

[twotonevert]

Man, wish I knew, someone will chime in. Welcome to the oRg. I think that signal comes from the "gear position switch". Still looking. Maybe the black wire, someone confirm?

[fiend]

Welcome to the org.! I'm thinking the GPS to is where it would be.

[bpcough]

thanks guys. I put 12 volts to the red wire with the motor in neutral and tried
a test light on both the blue and black wire and got no light.
I am a bit puzzled. I wil post some pics as soon as i figure out how to.
Bryan

[bpcough]

Here is a photo.
I hope it works
Bryan[IMG]
http://i718.photobucket.com/albums/ww186/bpcough/hayabusa.jpg[/IMG]

[GIXERHP]

Pm smithabusa, he can help you out!

[dadofthree]

B/W is negative, P to P on the ECU, Bl to Bl on ECU wiring diagrams 8-14 and 8-15 online manuals for 99-07.

[bpcough]

I see that my image link does not work.
It is a project that I work on with my students.
This is a photo of the car at the toronto International Autoshow this year.
Try this one.
Pictures by bpcough - Photobucket
Bryan

[omslaw]

When you release the clutch and it doesn't move...it's likely in neutral

Umm - Yeah, smithabusa would probably be able to tell you right off.

Take this with FWIW, though. I've never taken the GPS apart, but what I've read...I believe it's more or less a bunch of resistors. The 3 wires that you're referring to on the clutch side are the GPS... I bet one is ground, another is +5V DC and the 3rd is a 'sensor' wire. The ECU is reading the voltage off the sensor wire. Each gear has a specific resistor - 6.8K for 5th, 15K for 6th, etc. By reading the voltage on the sensor, the ECU knows what gear the bike is in. Now, all that said, I don't know what the value is for neutral...this is where smithabusa may be able to help.

My guess is that you would have to build something that will trigger at a certain voltage...

Or here's another thought, get a gear indicator, such as a GI Pro, Acumen, or even one that smithabusa builds... Then you would know all your gears as well as neutral.