Battery light on after replacing battery and alternator

Asked by May 13, 2019 at 04:49 PM about the 2009 Ford Focus

Question type: Maintenance & Repair

2009 Ford Focus
Replaced alternator, battery and fan
belt two months ago. Battery light
coming on and off. Mechanic
checked alternator but said it is
charging. Car running fine otherwise.
Any ideas?

1 Answer


Charging begins in the alternator, then goes through conductors and connections along with devices, such as voltage regulator. You might have a defective device or a loose/corroded connection that's blocking current.

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