The amount of voltage at the #1 terminal will determine how fast the alternator must turn before it begins to charge.
A diode in line (series) with the light will not make any difference since the light bulb is the resistance that lowers the voltage at the alternator. If you wire the diode in parallel with the light the light will not turn on since the current will flow though the diode rather than the bulb.
You need a minimum of about 6 volts to get the alternator to start at a lower rpm. You can use a resister wired in parallel with the light to increase the voltage available at the #1 terminal. The resistor will however cut down on the brightness of the light.
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Today's Featured Article - Old Time Threshing - by Anthony West. A lovely harvest evening late September 1947, I was a school boy, like all school boys I loved harvest time. The golden corn ripens well and early, the stoking, stacking,.... the drawing in with the tractors and trailers and a few buck rakes thrown in, and possibly a heavy horse. It would be a great day for the collies and the terrier dogs, rats and mice would be at the bottom of the stacks so the dogs, would have a busy time hunting and killing, all the corn was gathered and ricked in what we c
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