Last wiring Question

[rb25drag]

I need to know Exactly which Wires on the ECU White plug up in the dash needs power for the rb25 ECU to run?

I think there should be a Ignition power and a Constant 12v power.

Since I have re-wired my entire Ignition system Im not receiving any power to the ECU. Which isnt triggering my fuel pump.

These are the only things left I need to fix. But I don't wont to fry my ECU in the Process.

Im not the best wireman but ill do it before I pay someone else to mess it up.

[rb25drag]

This is what I have searched and found.

3. From the brown KA plug under the dash above the ECU, connect the Orange wire (#34 Start Switch @ ECU) to the RB white plug Grey/Red wire (AF09 Start Switch).· 4a. From the KA ECU plug, connect Red wire (101 ECCS Relay) to RB white plug Red wire (AF04 Ign Relay).· 4b. From KA ECU plug, connect Black/Red wire (#36 Ign Switch Fuse) to RB white plug Black/Red wire (AF36 Ign Relay). Get this B/R wire from the KA wiring harness.

The wire I had to replace Im having problems with is the Red/Black wire. So my question is Im assuming the Red/Black #36 IGN switch fuse wire is the one I need to replace. But Im not sure were exactly its running from. Or what power it needs.

[rb25drag]

guess im on my own again!! Thanks guys.

[Shocker]

I think I remember doing the orange and red/black when I did my standalone to the dash... buy a damn 240sx FSM, thats how I traced and wired mine all in. I cant remember which is which I did it like 1 year ago lol.

W/e it is it goes to the ign source on the tumbler so the ECU sees power when trying to crank, which I'm sure you already know lol. I'm pretty sure that wire is the red/black one, I remember tracing something along those lines.. I could be thinking of the fuel pump though...

[tek747]

Im kind of in the same situation..... what car do you have? S13 or S14?

[rb25drag]

I have a s13, I finally fixed mine this weekend. Turns out it was 4 wires melted together on the passenger side wiring harness from the fuse box. Looked like I had a head light bolt rub through the harness and shorted my wires. I re-done those wires hooked everything back up and she purs nicely.

So what exactly is your problem? Hope its not as bad as mine was. it took me a month to find my short.

[Shocker]

glad you found your issue!

[tek747]

I got an S14 but cant power-up my ECU or get a starter signal! Its been driving me crazy. Theres a possibility (a lame one...) that my battery might be to weak for the starter or its just stuck. As for Ecu im walking in circles and rubbing my head.