What you need to do is isolate the short then.
Follow the white wire from the alternator connector to the M116 white connector inside of the car by the ECM if this has continuity from the alt connector to this connector then your issue is in the dash harness.
IF you have continuity in the harness proceed to remove your speedometer and check the alternator light pin in the speedometer and check continuity to the M116 connector.
If your issue is in the dash harness you should see your volt gauge display regular charging voltages. If your volt gauge reads low and you dont your light is not working then it's possible the alternator regulator burnt up not triggering the light and not charging as well.
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