I am installing a replacement alternator and the 3 pin connector is different than the original. My 2003 F-250 has a three pin connector but only two pins are used. Wire schedule is one red/blue and one green/red. The new connector is marked with "A", "I", and "S". I guess I only need to know which original wire is ignition and which is battery +.
TIA

 

No one knows?

 

https://www.ford-trucks.com/forums/233948-wiring-diagram-for-new-style-ford-alternator.html