1992 Ford Aerostar Car stalls while driving; now starter won

Electrical problem
1992 Ford Aerostar V6 Four Wheel Drive Automatic 243,00 miles
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Hello

I first installed a new solenoid, and a new battery, as apparently, the battery drained completely dead; I cleaned the battery terminals and installed the battery and solenoid, near the firewall close to the battery.

I have a shop manual which shows a starter relay switch, which I have been unable to locate. I see two wire connectors, when tested showed power with the Voltmeter.

After reading the shop manual showing a starter relay switch (stating below and behind the battery), I am fairly confused at this point.

Do you think that the bendix spring in the starter could be stuck?

Or do you have any other help you may give?

Thanks