Battery Warning Light Humming? Diagnose Electrical System Oddities

The normal reading for a fully charged battery would be more or less 12.6, with the engine off and no lights on. Once the engine is running, ... 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 ... 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 ... the car runs fine but the light stays on please help? ... mine does the same thing... along with the oil light.. ... check the battery voltage with ... If the voltage drops it may mean that the supplied battery power is too low when the car needs more power. This may be due to poor wires not ... The car starts fine but the dash shows a "service battery charging system" message and the battery symbol/light is on. 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 ... 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 ... It seems like the only possible sources of this problem are: loose belt (I don't think so), bad ground (seems ok, but maybe not), bad alternator ... Tangent but perhaps related: In one of the not-a-Honda cars I casually chased a similar issue for a while. ... The problem turned out to be ...