I bought a civic, and i bought a salvaged (rear end damage) acura cl.

im going to pull out of the cl
the engine, wiring harness, transmission, and axles.

same with the civic, yet just drop the cl parts into the civic.

the question is, what exactly is the wiring harness connected to? i mean do i just unplug a master port from the car or are they all seperate wires going to the fuse box?