Ignition Schematics

[KTKai]

I was wondering if anyone knew the ignition schematics on a 1991 240sx? I am trying to change my ignition to a push button starter and I need to know which color wire leads to the starter from the ignition. I think the color choices are Black/white, brown/yellow, and red/black. If anyone knows please let me know. Thanks!

Kerissa

[g6civcx]

I know, and I'm letting you know. You never actually asked which wires go to the ignition. You just asked to let you know if I knew. Phrase your questions carefully.

FYI, read what I wrote carefully before responding, or you will be flamed by others. I see you already have one red spot in only 13 posts.

First, you need to read the FSM, EL section. It describes the starter schematic and ignition switch.

Second, you need to realize that when you turn the key to start, the ignition switch disconnects all the accessories to give the battery full cranking power. That's why your radio cuts out momentarily while you start the car.

Any reputable starter switch will have accessories inputs and a relay to shut off current draw from the accessories. Don't install a momentary switch as a starter switch.

I think the color choices are Black/white, brown/yellow, and red/black.

Read carefully

Colour choices are White (constant power), Blue (accessories), Black with Red stripe (ECU power-on signal), Black with White stripe (starter signal to starter solenoid), and Black with Yellow (starter signal to ECU).

When you turn to ACC, White and Blue are connected. When you turn to ON, White, Blue, and Black with Red are connected.

When you start, all are connected except Blue. The ignition switch disconnects the Blue lead, which cuts off the accessories.


If you have no idea what I just wrote, do not bother with a start button. You don't need it.