ALTERNATOR FORD CHROME 100A

(12VDC SYSTEM NEG GROUND)

There are multiple letters on the voltage regulator itself.

The F goes onto the field post on the positive side of the alternator.

The I goes to a fused + 12vdc (fuse panel)

The A ?

The S ? I think this goes to the switched "on" ignition point of the key.

Any other valuable hints?

F terminal on the regulator connects to the field connection on the alt.

S terminal on regulator connects to the stator connection on alt.

A terminal on regulator connects to the battery +( Plus) or positive terminal. (senses voltage of battery)

I terminal on the regulator connects to the ignition switch. (turns regulator off & on)

Caution do not connect I to spark coil +(positive) terminal,: may cause engine not to turn off.