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Q: ALTERNATOR WAS REPLACED BUT BATTERY STILL GOING DEAD on 2001 Ford Explorer

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ALTERNATOR WAS REPLACED BUT BATTERY STILL GOING DEAD ALSO IF I DISCONNECT NEGATIVE CABLE ENGINE TURN OFF
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Never ever ever disconnect the battery while the car is running. You can and will damage components.

Sounds like the battery itself may need replacing as it is. Charge and/or replace the battery and retest your electrical system.
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