Jim, generator "idiot light" operates on 24 Volts, and doesn't depend upon the chassis ground at the midpoint of the series-connected 12 Volt batteries to operate.
The older ones had a resistor built into the switch to allow the use of a 12 Volt indicator lamp, the newer design had a resistor connected to one of the pigtails of the "idiot lamp".
I just dealt with this a few months ago when I installed an isolated ground 2 Volt alternator on a 24 Volt 4020.
IIRC, the resistor connected to the pigtail Ohmed out at about 53 Ohms.
If you look closely at the two diagrams posted by the O.P., you can see the resistor in both diagrams.
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