My nephew has a baja 90,that was left out in snow all winter because his dad was away at work,now he is home and trying to get it going.but the ignition is all corroded up,so we're taking the ignition out all together,how would we go about wireing it up

I think green is groung
red annd black go together
what do we do with the other black wire with white stripe

Thanks in advance for putting a smile on my nephew's face

 

This is how the ignition switch wires normally connect:

Ignition On:

1) Black and Red are connected
2) Green and Black/White are disconnected

Ignition Off:

1) Black and red are disconnected.
2) Green and Black/White are connected

Red is straight from the battery through the fuse

Black is switched 12 volts that goes to any 12 volt stuff such as the starter engage/interlock circuitry.

Green is ground (as you surmised)

Black/White is a kill switch wire which goes to the kill switch input of the CDI. When you ground this wire the spark is stopped and the engine dies. Note that the ignition system runs on it's own moderately high voltage AC supply (up to a couple hundred volts) coming from the stator when the engine is turning. Thus simply removing 12 volts (via the red and black wire) will not stop the engine from running. You need to actively kill spark by shorting the CDI kill switch pin to ground.

So you can start the quad with simply connecting the red and black together. Leave the green and black/white wires disconnected. It just means that now you will have to kill the engine using another kill switch such as the handlebar kill switch.

Caution: The black/white kill switch wire has high voltage on it whenever the engine is turning. It can be a couple hundred volts when the engine is running at speed. Do not grab hold of it with your fingers whenever the engine is turning (even if it just being turned with the starter motor). You will get bit...

You can get a "sort of" wiring diagram for your quad by downloading the manual from www.bajamotorsports.com. By "sort of" I mean it is riddled with errors (like most published wiring diagrams), but it is a good starting point.

You could always get another keyed ignition switch on eBay (or dozens of other sources). They are not that expensive.

 

very detailed, exactly what i was lookigg for.
thank you very much and have a great day