What does the wire get connected to?
 

I am wrapping up my LS1 conversion in my 59 Bel Air, and I am puzzled by one wire. It is a purple 16 ga. wire that is in the harness that goes down by the crank sensor and starter. It is terminated with a 3/16 ring terminal on it. BTW, this is a GM Performance wiring harness / ECM #12480113. This appears to be the only item that is not marked. Does it go on the starter? Ground? (Can't imagine that due to it's purple color)

In advance, thanks!

Tim

that's the starter crank wire from the ignition switch.