Exactly. The purple wire is the one that used to go to your starter solenoid. You move it up to the Ford relay, to the 's' terminal, just like it was on your solenoid. The coil resistance of the Ford relay is about 20 times as much as the starter solenoid, so the current through the ignition switch/neutral safety switch loop is greatly decreased. Since the Ford relay is rated at many more amps than the solenoid coil can draw, it has large contacts and will provide the absolute maximum current to your solenoid.
"For those that will fight for it...FREEDOM ...has a flavor the protected shall never know."
Semper Fi! L/Cpl Edwin L. "Tim" Craft, B Co 3rd AT's, Khe Sanh Combat Base, February, 1968