Not sure what you mean?
First lets speak the same language
The starter Solenoid is on the top of the starter motor, it moves the starter gear out to engage the ring gear
Solenoids MOVE things
On the inner fender is the starter Relay, it sends voltage when activated
Relays connect electrical circuits
So the thing on the inner fender is a relay, but was called a solenoid for many many years, it ain't its a relay, lol
Yes, the "I" post was dropped on starter relays so they are all 3 post now, "I" was for the spark coil
The smaller "S" post on the relay in your picture gets 12v with key turn to START, and that activates the relay
For 70+ years the starter motor was wired like the top drawing here:
http://www.garysgaragemahal.com/uploads/6/5/8/7/65879365/mini-starter-wiring_orig.jpg
Battery------(cable)----------relay------(cable)-----------starter motor(one "wire" starter motor)
Then Ford switched to a new starter motor with a combo relay/solenoid on top, so they didn't need the inner fender relay any more, starter motor has the "S" post and positive battery cable, so two wire
Then in Ford's infinite wisdom, and because they were stuck with a BOAT LOAD of these 3 wire fender relays, they decided to use them up
And thats the lower drawing in the above graphic
The fender relay is not needed any more and it did go away, when they ran out of them, lol
So which starter motor to you have?
Solenoid only, 1 wire
Or combo relay/solenoid, 2 wire
They look way different