Ford 3G Alternator Wiring Diagram - Mega Fuse, Regulator & Charge Lamp Circuit

This document is a wiring diagram for the Ford 3G alternator charging system. It shows the alternator with its internal components: the stator, rectifier (spelled 'RECTFIER'), and internal regulator containing sensing and switching circuits, plus the field winding. The alternator's B+ output terminal connects through a MEGA FUSE to the battery (spelled 'Battrery'). Three regulator connector terminals are shown: S (stator tap, connected internally with a White/Black 'W/BK' wire), A (battery sense, connected via a Yellow/White 'Y/W' wire to the B+/battery feed downstream of the mega fuse), and I (indicator, connected via a Light Green/Red 'LG/R' wire to the charge indicator lamp). The optional instrument cluster contains the charge indicator lamp with a 510-ohm resistor wired in parallel, connected at cluster pins 6 and 7. Pin 6 is fed from a 'Hot in Run' circuit through a 20A fuse. A reader can learn the basic circuit topology of the 3G alternator: which wire colors serve the sense, indicator, and stator functions, that a mega fuse protects the charge output cable, and that the charge indicator lamp circuit requires either the bulb or the 510-ohm resistor to excite the regulator. No specific vehicle year, model, or part numbers appear on the diagram.