No crank/no start...starter wiring help?

[FourtyKid]

Won't crank at all. Everything else works in the car, just not the starter. I've already tested my starter, it works great. So I know it's a wiring issue.

Here's what I've got.

Starter wire (black with a yellow stripe) goes from starter solenoid straight to this plug, then after the plug, white goes into the fusebox/fusible links and the black/yellow wire goes up into the main body harness...


Here's my clutch interlock relay:


I also have this plug, does anyone know what it does? Thick black wire and thick brown/white striped wire:



According to the FSM, the white wire that shares a plug with the starter wire should be black with a white stripe, not white. But I don't have any other plugs that would even look close to this or have either a black/white wire and black/yellow wire...help?