Hello im working on a s5 turbo2 rx7 and the bac isnt hooked up to any wires the car has a microtech ecu but still runs the factory ecu for the Bac, ac, and omp controls... So the stock harness is still in the car but has allot of cut wires need to know what color wires are from the factory wiring to the BAC if anyone knows thanks

 

You should download the FSM so you can track this down yourself...but I did it for you.

Page Z-38: L/G (blue/green) from the ECU, B/W (black/white) from the main relay.