George, if youre replacing an old 2 wire Cutout Relay and LHBD light switch system with what sounds like a 4 terminal (BAT ARM FLD LOAD) Voltage Regulator, to specifically answer your question ". . . and then run a wire from the L connection on the regulator to the Field resistance connection on the switch . . . ."
THE ANSWER IS NOOOOO OOOOO OOOOO You no longer use the switch terminal that used to wire to the gennys Field post.... The VR's L terminal is to feed hot battery voltage to loads (via the switch) like lights n ignition (if a coil ignition) instead of them being fed from the ammeters Load (NOT battery/starter) terminal as they were before Heres the correct way to wire that 4 terminal Voltage Regulator BAT wires up to the Load (NOT battery/starter) side of the ammeter. That would be the same terminal (and wire) that wired to the BAT side of a Cutout Relay and also supplied hot battery voltage to lights n ignition. With the VR and its L terminal it now feeds them instead, so remove any wire from the ammeters load terminal to the switch and wire the switch instead to L on the VR. ARM/GEN on VR wires to gennys ARM post FLD on VR wires to gennys FLD post L on VR wires to BAT input terminal on switch (instead of it wiring to the ammeter) NOTE on many 4 terminal VR's the termiunal off on one side or the bottom all by itself is the ARM/GEN terminal and the 3 side by side are BAT FLD LOAD NOTE it will still work if loads are kept on the ammeter (same terminal that wires to BAT on VR) and the L terminal isnt even used, but I would use the L terminal AGAIN DO NOTTTTT TTT WIRE THE VR'S L TERMINAL TO THE LIGHT SWITCH If its an older 3 brush genny you may want to adjust its third brush to the max charge position if youre converting to a VR instead of the old relay n light switch system. Id Polarize the genny before you fire her up John T
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