Quest to getting my Slant six to turn over

Vamisk said
I got my starter fixed and it still wouldn't crank.
I was going to ask what's up when i traced this particular wire all the way back to the gearbox.
So if this is indeed the NSS, how can I connect it to my relay? Obviously someone replaced the relay with some newer one. Not sure which post it should connect to.

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The replacement terminal at the battery is a trouble spot. They do not clamp tight on the cables, and the strap that bolts down invites corrosion.
Your wiring is modified with added contactor, replacing the original start relay. It could be that setup never got it going.