battery light indicator blinks for a short time the engine power dies why? on 2004 Hyundai Elantra

battery light indicator blinks on-off quite several times and stops dead and the dashboard lights and headlights got dim while driving and the air conditioner heater blows dying heat air even if the temperature control setting is set maximum not full blast occurs both on-off for a short time

Asked by for the 2004 Hyundai Elantra
have complete charging system diag
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have complete charging system diag
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