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- Nov 11, 2013
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- 5,411
As I have read, it started as small telltale lamp on a dynamo or battery circuit whose brightness indicates the voltage of the current.I've wondered if the pilot bulb was mainly there in reserve for those occasions where the main bulb filament broke from vibration on a night ride. You could pilot your way home slowly and carefully on the pilot beam.
Glen
Or maybe as in a real Gas circuit, it was the ignitor.