Quoting Removed, click Modern View to seeAs LJD said, probably not enough excite current. Yes, it has worked in the past, but every alternator isn't absolutely identical & when it did work in the past, it was marginal (but works counts). Yes, hundreds have gotten by with those little bulbs in the past....most likely because the bulb's cold resistance is low enough to shock/jolt the alternator field, because those little marker/clearance/dash bulbs such as 194, 1895, 1815, 53, 57, only draw about 1/10 to 3/10 th of an amp AND the field begins to kick in at about 3/10 th amp (right on the edge/marginal). GM placed a 10 Ohm/6.25 Watt resistor in parallel with that little idiot light so as to provide nearly a full ampere of excite current.
You could parallel more little bulbs, use larger bulb, or do as GM did and parallel with a resistor, or just use a diode.
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