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Your voltage checks are all normal. This leaves you with a faulty alternator or ground.
The alternator is responsible for grounding the bulb circuit. You can do a quick bulb test by bypassing the alt. Disconnect the two pin connector from the alt and use a short piece of wire to hotwire the white/red wire straight to chassis ground. The charge warning bulb should illuminate nice and bright whenever the key is turned ON.
Test the alt ground wire or temporarily replace it.
If an alternator has extremely underdriven pulleys on it; it won't spin fast enough to charge at idle.
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