G1 on page 22 of the Snapper Safety Instructions & Operators manual there is picture of the switch's back side with the terminals lettered.
At 12 O'clock is terminal B, a 20 amp fused red wire going to the starter solenoid's 10 mm battery terminal.
9 O'clock is terminal S, it is a red wire which goes to a male spade connection on the starter solenoid.
3 O'clock is G terminal, it is a black wire that says off, it shows it going to the starter.
7 O'clock is M terminal, it a blue wire going to the magneto that also says off.
4 O'clock is the L terminal, it says run with a red wire going to the hour meter and to the buzzer.
I traced the blue or purple colored B+wire from the regulator/ rectifier through the kohler side of the harness, it turns red at the Snapper side of the connection and then goes to a 20 amp fuse and then directly to the solenoid's 10 mm battery stud. The Blue magneto wire has to be the kill wire or it wouldn't have to be there.
I don't understand it myself but that's what I have. I'll check the battery tomorrow to see if the voltage has drawn down.
I'm thinking it won't drain the battery unless the diode has shorted to ground. Other than that the voltage just sets there ready to incite the alternator.... then when the engine starts runing the rectifier/regulator starts charging the battery. The blue M wire must kill the mag. I'm just guessing here, I don't know for sure.