Find electrical schematic diagrams for alternators at AlternatorParts.com and Chargerr.com. Another good online resource for alternator electrical schematic diagrams is AllAboutCircuits.com, which also contains information on how an alternator works.
Chargerr.com reports that the three primary electrical wires contained in an alternator are the BATT, FIELD and SENSE wires. The website offers descriptions of the functions and locations of these wires as well as illustrations of alternator circuit schematics and information on the proper voltage of alternators. Alternator Parts provides a functional electrical diagram of an alternator in addition to descriptions of the various components of which an alternator is comprised.