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My car died while driving last night so i replaced the battery. AutoZone tested alternator and said it was working but draining my battery slightly...what could be causing this?

Here are a few potential reasons why your alternator might be draining your battery, even though AutoZone tested it and said it was working:

1. Faulty wiring or connections: Check the wiring and connections between the alternator, battery, and other electrical components. Loose or damaged wires can cause resistance and prevent the alternator from properly charging the battery.

2. Voltage regulator issues: The voltage regulator controls the amount of voltage output by the alternator. If the voltage regulator is faulty, it may allow the alternator to overcharge the battery, which can damage the battery and cause it to drain quickly.

3. Diode failure: The alternator contains diodes that prevent current from flowing back into the battery when the alternator is not generating electricity. If a diode fails, it can allow current to flow back into the battery, draining it.

4. Internal mechanical problems: There may be internal mechanical issues with the alternator, such as worn brushes or a damaged rotor, that are causing it to malfunction and drain the battery.

To accurately diagnose the root cause of the problem, it's recommended to have your car inspected by a qualified mechanic or an auto electrical specialist. They can perform additional tests and troubleshoot the issue to identify the specific component that is causing the battery drain.