If your car battery light keeps coming on and its not your battery or belt or alternator what could it be?

If your car battery light keeps coming on despite having a good battery, belt, and alternator, it could be due to a faulty voltage regulator, which controls the voltage output from the alternator. Additionally, loose or corroded connections in the battery or charging system can cause the light to activate. It's also possible that there is a problem with the car's onboard computer or wiring issues, which may require a diagnostic check to identify.