There were basically two different charging systems used (manual Low/High on light switch or Voltage Regulator) and on different years and models two different Voltage Regulators (3 or 4 terminal).
1) Manual light switch Low/High charge control that used a Cutout Relay instead of a Voltage Regulator. Gennys FLD wired to light switch
2) Automatic charge control that used a Voltage Regulator (NOT just cutout relay) and the light switch controlled the lights only not the charging.
3) Voltage Regulators used were 3 terminal BAT GEN/ARM FLD in which case loads like lights and Ignition were fed off the ammeter
4) Voltage Regulators used were 4 terminal BAT FLD LOAD GEN/ARM in which case loads like lights and ignition were fed off the VR's 4th LOAD terminal instead of ammeter
A) If it uses a 3 terminal Voltage Regulator
BAT on VR to load side of ammeter GEN/ARM on VR to Gennys ARM post FLD on VR to gennys FLD post THE GENNYS FLD DOES NOT WIRE TO LIGHT SWITCH
B) If it uses a 4 terminal Voltage Regulator
BAT on VR to load side of ammeter GEN/ARM on VR to gennys ARM post FLD on VR to Gennys FLD post LOAD on VR to light/ignition switch THE GENNYS FLD DOES NOT WIRE TO LIGHT SWITCH
c) Manual light switch Low/High and CutoutRelay
BAT on Cutout Relay to ammeter GEN on Cutout Relay to Gennys ARM post FLD on Genny up to Low/High Light switch
See Diagram for a 1947 B for a Light Switch Low/High manual charge control and cutout relay NOT a Voltage Regulator. Its possible to convert from a cutout relay and light switch to a VR as described above but in that case do not wire FLD to light switch but to VR instead.
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