What if you changed the alternator in a 1997 Chevy Malibu but when start car and remove positive battery cable dies off do have to change fuse?

It's unlikely that changing the fuse will resolve the issue if your 1997 Chevy Malibu dies after removing the positive battery cable after replacing the alternator. Here are a few possible causes and their respective fixes:

1. Loose Connections: Ensure that all the connections, particularly those related to the alternator and battery, are secure and tight.

2. Faulty Wiring: Check for any loose, damaged, or corroded wires in the electrical system. Repair or replace any faulty wiring as needed.

3. Defective Voltage Regulator: The voltage regulator is responsible for controlling the alternator's output. A faulty voltage regulator can cause the alternator to malfunction and result in the car dying when the positive battery cable is removed.

4. ECU Issues: In rare cases, a faulty Engine Control Unit (ECU) can also lead to similar symptoms. If the ECU is not functioning correctly, it can affect the charging system and cause the car to stall.

Before replacing the fuse, thoroughly inspect and troubleshoot the aforementioned areas. If you're unsure or uncomfortable performing these checks yourself, it's best to consult with a qualified mechanic or take the vehicle to a reputable auto repair shop for professional diagnosis and repairs.