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What is the problem when red battery light on your 2002 Ford Fiesta lit but car will start?

There are several reasons why the red battery light on your 2002 Ford Fiesta might be lit even though the car starts. Here are some possibilities:

1. Alternator Issues: The alternator is responsible for charging the battery while the car is running. If the alternator is faulty or not functioning properly, it may not be able to generate enough power to charge the battery, causing the battery light to come on. Have the alternator tested to confirm if it's working correctly.

2. Battery Problems: The battery itself could be the issue. A weak or damaged battery may not be able to hold a charge, causing the battery light to illuminate. Check the battery's age and condition, and if it's old or shows signs of damage, consider getting it replaced.

3. Loose or Corroded Connections: Loose or corroded connections between the battery, alternator, and other electrical components can disrupt the proper flow of electricity and cause the battery light to turn on. Inspect the connections for any signs of looseness, corrosion, or damage, and clean or tighten them if necessary.

4. Electrical System Issues: Other electrical problems within the car's electrical system, such as faulty wiring, damaged relays, or a short circuit, can also lead to the battery light coming on. These issues are more complex and may require professional diagnosis and repairs.

If the battery light remains lit even after addressing the above potential causes, it's recommended to have your car inspected by a qualified mechanic to identify and resolve the underlying problem accurately.