j1 connections on the P & S controller

[gs455tpi]

I searched for this but didn't get a hit. For those familair with this controller:

I understand the power input and the throttle resistor inputs. Is location 3, contactor, an input or output from the contactor, and what is the level?

Also is the initial setting for VR1 full ccw plus a bit?

one more, how does the precharge get started?

Thanks for the comments--