need help wiring 1978 ESC

[Jeepen]

Adding a turbo to 3.8 i have the wiring harness unclear about the 2 wires that go to the relay pink appears as positive , does the relay wire purple
ground the unit or another positive? Thanks for your help

 

[b4black]

Maybe this will help:
http://www.beforeblack.net/images/wire78esc.jpg