Hey Guys,

I have an issue. 03 Evo8.

ECU pin(s) 12 and 25 (Switched 12v supply)

Im not getting power on anytime with these 2 pins. I need some info on where the 12v comes from on these pins. I have been searching and looking through the manuals but I haven't found a wiring diagram worth a dam to show me where they are leading from to go into the ECU.

Recently the car was running on Stock ecu, tuned on speed density, blah blah blah, no issues (Never checked these pins before obviously).

The car was torn down for new turbo setup, im, tb, etc. In the process a set of FIC 2150s have been fitted to the car. I opted for the splice in harness (Wiring there is correct, im 99% sure due to the fact I wired them according to how the plug and play harness is used) and the resistor box removed (Cut the wires and soldered them all together).

I go to install my haltech ECU and it doesnt power on. Look at wiring diagram for the patch harness and it draws its power from those pins....


Any ideas where those wires get their power?