I thought I could color the schematic so that it would explain the write up. But I guess unless you know electronics it gets confussing
as stated, durring cranking, the current needed to "flash" the alternators field goes thru the lamp (and thus it glows)
when the alternator spins and produces voltage, a center tap is used to tell the regulator to switch from "flash" to self substaining. this is relay R2. now the field current makes its round about and there is no current thru the lamp (and thus it is out)
so the regulator is in fact the problem, even though it is "working"
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