Squareback vs round back alternator?

This is a big help.
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We see an original starter. The starter solenoid is attached to the starter. From the 1960 diagram, there was no starter relay yet.

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Heavy Battery cable to the starter.
At that starter terminal, it is joined with the H-1 wire and A-1 wire.
H-1 is power the horn relay for the horn.
A-1 wire going to the Ammeter's S terminal. This is battery power to everything else. Also is charging wire while driving.