Currently installing a ffim and can’t seem to find where this plug goes and the car won’t crank. It branches off the harness along with the knock sensor wire.
I hope it goes to the starter, but I can’t check because I injured my neck working on this pos.

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That looks suspiciously like the early style flat plug that goes into your early style (1992-1994 SC300's usually) starter. Check it to make sure there isn't a receptacle on it that isn't plugged in.

 

Thanks. That was the plug that went to the starter.