S12 ca18det brief pointers

[30psi]

Thats a part of the loom that contains the 3 green relays I think

[sjef200sxTurbo]

so i would have to swap the whole relais box?
And then hook it up to where de old single ignition coil used to be or something?
Doesnt it just reinforce the signal for the coilpacks?

[30psi]

I removed the engine loom from the S13. The I followed where the engine loom connects to the chassis loom, it goes from the left of the car inside the wings, under the slam panel through to the other side and to the box with the 3 green relays.

I then removed the wiring that wasn't needed in this loom to basically leave the 3 green relays and long wires that lead to the plugs that connect to the engine loom.

The 3 green relays power up the ECU, the power transistor and the fuel pump if i remember rightly.

You then need to work out which wires need permanent and switched power. Easily enough those wires are red and black, with a few red wires and a thin earth wire.

There are some other nice to have things, like the starter signal wire (will help it start quicker) and getting the rev counter to work.

[sjef200sxTurbo]

Yeah I im gonna get the relais box first,I know about the rev counter problem and the diode trick,I just gotta figure a lot of wires cause i have a LHD model and it seems that the colours dont match up to the guide.But atleast Ive got a non cat ca18det so atleast i wont have to worry about the lamba o2 sensor.
Il see how far I can come with it and il make some pics soon and post em up here .

[northerner]

Found this on AUS12 site that GerryB posted about were to wire in what for novices like me

---The white plug by the ECU has the wires you need for these items ONLY!!

* orange wire = start signal, goes to start wire at your s12 ignition plug

* black wire = goes to earth

* blue/black stripe wire = goes to s12 temp guage = temp signal.

These are the only ones you use from the white plug!!--
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

---The other wires are from the plug by the Maf connector in RED --

Black / Pink stripe
Fuel Pump Relay

Red / Black stripe
ECU Relay

Red
ECU Backup Power

Black / Red & Blue / Red (Note: connect 2 wires to 1)
Main Ignition Power

Black / White stripe
ECU Power

Brown (to O2 sensor)
O2 Sensor Power
Any 12v switched source


Yellow / Red stripe (or use the Diode to each Coil pack as suggested and take to the Silvia tacho)
Tachometer signal

[30psi]

If you follow that though you will wonder why there are a few red/black wires.

First time I followed it was when I wired up a T12. Ended up printing off the wiring diagram and following it from scratch.

Then when I came to do it on my 910 I pretty much knew what was what and had it running very quickly.

[northerner]

Found a pic of the mutliplug on US site under the air box to help

[sjef200sxTurbo]

With all these pictures it starts to become a bit clearer.
Think im getting there but i wish someone would post up pics of where al the wires connect 2 the s12 loom but this is a lotta help aswell.
But the relais box that with the 3 green relais that I pull out of the s13, can i just power it up straight from the battery?

Hope to have it running in a couple of weeks

[sjef200sxTurbo]

found this guide on an american site : http://www.club-s12.org/forums/index...ca18det+wiring

Its got all the relais ,alternator and starter under dash plug,
But nothing about where to hook the power transistor (or ignitor) up and the dropping resistor.

[northerner]

the dropping resistor and ignitor had there own plugs on the S13 engine loom. Dont worry about them as when you plug in the rest of the engine plugs ie injectors/cas/afm etc you'll work out which ones.