It is usually alternator trouble, but there are some rare cases where battery and alternator are okay but there is a loose or corroded joint in the wiring harness between the battery and the area where the battery light gets its voltage signal; this is usually downstream of a large bulkhead multipoint plug near the fusible links etc. The resistance from a bad connection at this point causes a loss of voltage due to the current flowing to the fuel injection pump, a/c, lights etc. It gets worse and when bad enough it will stall you. Get it identified by a competent auto electric shop before it strands you.
Check battery and alternator wiring and connections for corrosion/loose damaged wiring also check belt -tight not worn if they look good than have battery and alternator checked most auto stores offer this service for free
Either the alternator or battery is defective. Better get it fixed before you become stranded somewhere. If the battery is older than 5 or 6 years, it is at or near the end of its life.
Assumption (narrow)... what everybody says... INCORRECT! You buy a LOT of new parts and do NOT get your problem fixed! See Koozer's approach!
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