Careful, it seems like ford has repurposed the old solenoid as a starter relay to energize the “real” solenoid on the starter (unless everywhere I looked is showing the wrong starter).
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2010 Explorerer’s wiring diagram agrees. There’s two wires going to the starter, one directly from the battery, and one from the engine compartment starter solenoid.
Edit: Confirmed the starter on my own 70’s Ford truck is a one wire affair, the switched 12 volts directly from the battery via the starter solenoid. There’s no separate “s” terminal.