1. Faulty Charging System Components:
* Voltage Regulator: This component controls the output of the alternator. A faulty regulator might not be sending the correct voltage to the battery, causing intermittent charging.
* Diode Pack: The diode pack within the alternator prevents reverse current flow from the battery back into the alternator. A faulty diode can cause the alternator to "short circuit" and not properly charge the battery.
* Battery Cable Connections: While you mentioned new cables, check for corrosion or loose connections at the battery terminals, alternator, and starter.
* Alternator Wiring: Inspect the wiring from the alternator to the battery for any damage, breaks, or loose connections.
2. Other Electrical Problems:
* Battery Itself: Even with a new battery, it might have an internal problem. A battery load test can determine if it's holding a proper charge.
* High Electrical Load: Check for any accessories that might be drawing excessive power, such as a powerful sound system, aftermarket lights, or a faulty component that's shorting out.
* Corroded Ground Connections: A poor ground connection can prevent the proper flow of electricity, leading to charging issues. Inspect the main ground cable from the battery to the chassis and any other grounding points.
Troubleshooting Steps:
1. Battery Load Test: Have your battery load tested at a reputable auto parts store or mechanic. This will confirm if the battery itself is the problem.
2. Voltage Checks: With the engine running, check the voltage at the battery terminals. It should be around 13.5-14.5 volts. If it's lower, it indicates a charging issue.
3. Alternator Output Test: An auto mechanic can use a specialized tool to measure the alternator's output at various engine speeds. This will pinpoint if the alternator is producing sufficient power.
4. Inspect Wiring and Connections: Visually inspect all the wiring and connections related to the charging system, looking for damage, corrosion, or looseness.
5. Check for Electrical Drains: Leave the car off overnight and check the battery voltage in the morning. A significant drop could indicate an electrical drain from a faulty component.
Important:
* Safety First: Always disconnect the battery before working on the electrical system.
* Professional Help: If you're not comfortable troubleshooting electrical systems, it's best to take your car to a qualified mechanic.
It's important to diagnose the problem thoroughly to avoid replacing parts unnecessarily. Good luck!
