Good morning! New to the forum so be kind please

I am rewiring a 1950 chevy truck 3600 with a 1953 235 engine in it. I have purchased a new wiring harness from American autowire that has a wire going to the S post on the starter solenoid. The setup that ran had just the foot stomp pedal which I want to keep and had only the battery cable wired to it ( I think). How do I wire the purple wire to the starter solenoid if there is none? Thanks!!