Car's Strength Battery Light On, Performance Undeterred

Now the car starts and runs fine however, when the batter light is on I ... battery fine when the engine is running, but under full load (radio, It sounds like your alternator is working a little, but not enough to keep the battery charged. The "battery" light is actually driven from the ... Troubleshooting Tips for Battery Light On But Car Runs Fine ; Battery Light On, Loose or Corroded Battery Connections, Check battery connections ... You will find a bad alternator, most likely. Or take a volt meter and test voltage at the battery. Should be about 12 volts, engine off, and ... There will be warning lights still, but the battery light will be off. If you rep the engine over 4,000 RPM, then the battery light will come ... It can be due to the circuitry of the alternator. Or it can be due to a mismatch. Warning light circuit is looking for a certain resistance but ... Driving with the battery light on can indicate a low or dead battery, which is a potentially serious issue. A weak battery may not be able to ... I worked at an auto parts store a couple decades ago and at least back then, the test equipment didn't always tell the truth. Not much of a ... I measured voltage with the car running and it was around 13.8, but that was when the output was OK. After a week of seeing this light off ... Might be the alternator, might be the monitoring circuit. No way for anyone to know without throwing a multimeter and amp clamp on it to check ...