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Have you checked the wiring between the idiot light and the alternator? That could be an issue. In the STOCK configuration, power for the idiot light is switched by a relay and there is a diode (one-way valve for electricity) in this circuit. The bulb should illuminate with key on and engine...

Burned out alternator lights will do this. You know how a Delco SI alternator works, right? If the "idiot" light burns out, the alternator is dead. Since you have converted to single battery, a non-isolated ground alternator should work IF ground is negative with respect to the batteries...