in the pic in the lower left corner (battery tray) there are 2 connectors, that is the main harness.
goes by the right strut tower (left side of pic) Under the fuel filter, (one ground on the back of the strut tower) than it splits into the engine harness (which you already disconnected as the motor is gone) and it continues inside.
just have to unbolt the right kick panel, and unbolt the ECU. and there is another connector just to the right of the glove box. Disconnect and pull out from the engine bay.
I think that pretty much covers the main harness. As I just pulled mine out about a day ago
