12v is pretty easy.
in general.. most o fthe N wireing stays put.. and you can retask a few wires that were for the vreg and genny.
ignition and headlamp and starter wiring remains unchanged * ( add 12v lamps.. and add correct coil, and if need be, resistor inline. )
for the alt to genny swap.
line going to armature goes to charge stud. at reg. connect bat and arm wires and remove reg.
run the field wire to the #1 on the alt on one side.. and on the other side.. run it to a 194 lamp then to the key switch.
jump #2 to charge stud.
that's pretty much it...