Blackerninja

I have a Quickcar switch panel in my 1991 SR hatch, and the fuel pump is already wired to it.

I want to retain the security of having to have the key in the ignition to start it but be able to start it with the momentary switch on the panel.

How should I go about doing this? I'm not completely sure on how the ignition system works, but I'm blindly guessing that power is supplied to the key cylinder and when turned to acc, power is sent to the acc relay, switching it on, and then when it's turned to start, power is cut to acc and it sends power to the starter?

If that is completely wrong, forgive me for being ignorant, I've tried to research it on the forums and have looked through the diagrams in a chilton manual but don't want to go chopping away at wires because I've had wiring gremlins in the past and it sucked.

Blackerninja

If I'm correct on how power is supplied, could I take the power from the ON spot of the key and put it to the momentary on the panel, and have a toggle on the panel send power to the ACC relay after I start the car?

What do I have to take into account? I've read a signal is sent to the ECU when trying to crank?

KiLLeR2001

Ignition switch is very simple to understand. Looking in the electrical section of the FSM tells you everything.

There are FIVE wires that pertain to the ignition switch.

Keep in mind the wire colors below are from the harness side, not the side going to the bay. They will change to different colors.

#1: Solid white wire. This is a constant 12V source from the battery
#2: Solid blue wire. This is your ACC wire, when you turn the key to ACC, this wire will now have power. ACC will activate the ACC relays and will power on your radio, TCU, rear window defogger, meter illumination and auto antenna.
#3: Black w/ red Stripe wire. (I believe this changes to black w/white wire) This is the wire that receives power when you turn ignition to Ignition ON. In addition to the devices that turned on from the ACC wire, you will now have the remaining electronical components in the car have power.
#4: Black w/ white stripe. Goes to the starter directly, at the harness it actually turns into a black w/ yellow stripe wire going to the engine bay.
#5: Black w/ yellow stripe wire. (I believe this changes to black w/green wire) This goes to your ECU and daytime light control unit.

So in a nutshell, with your key in the ON position you need to make your momentary switch do the three of the following things:

#1: Cut power off to ACC (wire #2) entirely. You'll need the extra juice to start the car.
#2: Give power to wire #4 above.
#3: Give power to wire #5 above.

Once the car is started the key will still be in the ON position and you should now have power running from wire #1 to wires #2 and #3 only.

__________________

Blackerninja

So, could I connect wire #3 from the cylinder to the momentary switch as power, then connect wires #4 and #5 to get power when depressed, and connect wires #2 and #3 (#3 to the car) to a toggle to be turned on after car is started?

Should wires #4 and #5 be wired through a relay?

Blackerninja

It's this panel and the starter switch is a heavy duty one, I think made to wire directly

Ignition Control Panel 50-164

KiLLeR2001

I'm not going to look over all that your control panel entails but here is a mockup drawing I did to display the basics of what needs to happen...



Key must be in the ON position otherwise the car will start, but the fuel pump and other devices won't have power. If you want to eliminate the ignition switch all together you would need to also supply power to wire #3.

__________________

Blackerninja

Excuse the crude drawing, it's just to get the point across



Obviously leaving out fuses and realys but would this work?

Also, I should have showed the momentary switch tying into the factory starter and ecu wiring

Blackerninja

I believe this should work just fine as a turbo timer does pretty much the same thing with the ACC and ON wires, by piggybacking off the IGN's 12v constant

edit

Wait, does ON have power during cranking?

Now that I think about it, if the car shuts off when the turbo timer cuts power to the ON wire, the car won't start without power to ON?

I would go check with a multimeter but it's late and car is loud

KiLLeR2001

Yes, when cranking ON has power. Only ACC does not.

edit:

Glancing over your diagram, it looks like fail. #1 is a power source, why you have it to ground is beyond me. I would suggest either reading a lot more or getting help from someone you personally know (who knows electrical). Electrical is not something to play around with if you don't know what you're doing. Even I don't know everything there is and I always keep a fire extinguisher with me at all times. Saw my friends car go up in flames once, never want that to happen to me.

__________________

Blackerninja

Okay, that's logical now that I think about it.

New plan of attack...


ON wire from cylinder to momentary, which then connects to wires to starter and ECU

Prewired toggles with power on panel

First one wired to ON wire
Second is already wired to fuel pump
Third will be ACC

To turn on car-

Turn key to ON
Flip ON and FUEL toggles
Depress starter button
Flip ACC toggle

ready to drive.

Should I use relays or fues on anything or is everything already on a relay or fuse? The toggles are fused toggles

KiLLeR2001

You don't want to power the starter and ecu with the ON wire, you want to power everything from the power source wire because it is thicker. Everything gets its power from the white wire #1, you don't want to feed other devices from a smaller gauge wire.

Read the FSM online, look at the EL section for the starting system to see what I'm talking about.

If you want a switch to toggle the fuel pump you can use the ground signal to the EGI pump relay. It's a black w/ pink stripe wire.

If you use the stock power wires they are already fused. If you add your own 12V source you will need to fuse it.

__________________

Blackerninja

The #1 wire is shown to be connected to a battery. How about I use the ON wire to switch a relay to power the momentary?

The fuel pump is already hardwired.

Blackerninja

It's all finished and working perfectly.

ON and ACC on separate toggles, ON position powers the momentary switch which switches a relay to send 12v from battery to starter and ECU.