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The battery light on a Ford Focus indicates that the battery is not receiving a charge. This could be caused by a malfunctioning battery that doesn't hold a charge, or it could be due to leaving the lights on overnight, resulting in a drained battery that can still be recharged. To resolve this issue, you may need to jump-start the battery. Another potential problem could be with the alternator, which would prevent the battery from charging properly. Ignoring this issue could lead to a completely drained battery that won't hold a charge. A new battery typically costs around $110 to $130, while a new alternator may run around $400.
I have already swapped out the alternator, but the battery light remains illuminated.
The battery light on the Focus is a sign that there might be an issue with charging the battery. If the light remains illuminated, it could mean that there is a damaged alternator belt.