Another what are these parts and wires?
 

well the more info and help the merrier :) ECU is a N374 and harness is a S5 RHD

What is this exactly?
http://img685.imageshack.us/img685/7682/photo4yv.jpg

And what is this section of wire harness?
http://img337.imageshack.us/img337/299/photo5ei.jpg

What is this section of the harness go to "the cut loom coming off of the ECU, and also the yellow plug higher up on the harness"?
http://img832.imageshack.us/img832/9459/photo6zu.jpg

First Picture: That is the black box that is usually connected to the JDM S5 Turbo harness, USDM cars don't have it, and it's "use" has (as far as I know) never been really figured out. I remember a while back there was a effort to pull the ecu apart and really figure it out, but It lost steam.

https://www.rx7club.com/showthread.p...=jdm+black+box


2nd Picture: Engine bay harness, or atleast part of it. The big silver thing is the master relay, the fuse block. Looks like it is from a non-turbo since it SEEMS*** to have the alternator wiring on it at the top of the picture. Or it could be the battery connections, I can't see the top, probably battery connections.

It has been cut

3rd: Yellow plug higher up in the harness goes into the "body harness" of the car. Essentially a connector that connects the "Body" electrics to the "engine" side.

These are all damaged, and would require quite some time with a Factory Service manual to repair, refer to your https://www.rx7club.com/2nd-generation-specific-1986-1992-17/knightsport-ecu-engine-different-wireharness-977471/
thread to see interchangeability options

-Marc

Where does this black box get mounted? And the only related wires I could see are in that cut loom off the ECU? I want to attempt hooking it all up and running it since I'm running nothing but just the engine on the entire car