Never mind, i've figured it out.
Just in case someone else needs to do this:
The 2 pins on the VN alt are labled 'L' & 'S'.
The 'L' terminal is the 'light' terminal. Connect the small connection to this.
The 'S' terminal is the 'switch' terminal. Run a wire from this to switchable power.
Note: switchable power, not constant power.
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