I assume you mean the white wire under the rear motor cover? If so Sta-Rite puts a wiring diagram inside this back cover. Hopefully it is still intact for you. Depending on your model and if it is wired for 115vac or 220vac will make a difference. I would suggest you go to the link I attached and look up your manual. The manual will have the wiring diagram for you.
http://www.starite.com/

I hope this helps you out. Please rate my response. thanks