Battery Light Glows, Car Defies Unraveling the Paradox

The red battery light basically means that there is an issue with your alternator, your battery, or some other part of the charging system. Check the PCM for fault codes, there are other charging system problems that can cause the charging system light to illuminate. 1 Like. 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 ... 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 ... Could be a bad connection but this is usually an alternator fault. When the engine is running, a 14v reading at the battery is bang on. Are you ... The car starts fine but the dash shows a "service battery charging system" message and the battery symbol/light is on. Your symptoms are that of a bad battery or alternator... Have both checked to be sure they are performing correctly. Most likely the brand new ... 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 ... Your engine is off, at this point. When your engine is running and your alternator is charging, the voltage from the charging alternator is felt ... I hooked up a voltage meter to the battery with the car off, and it gets a solid 12.5v (fairly newish battery.) With the car running, I tested ...