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Battery light is coming but charging is 15.45

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The light will come on if it over charges too ! all vehicles have computer controlled charging system now a days !
Regulated Voltage Control Explained Regulated Voltage Control uses information from the battery current sensor, calculated battery temperature and system voltage to determine what the perfect voltage to supply the battery with is. In addition to nurturing the battery into longer life by maintaining proper state of charge, RVC allows the charging voltage to drop below the 13.8 to 14.8 volts to which we're all accustomed. If the battery can maintain an 80% SOC with 13 volts at a particular temperature, why would we want to charge it at 14.8 volts?

Posted on Apr 29, 2015

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Brake light& battery light keeps coming on now car won't start


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I have a 2005 Saturn Vue which battery warning light sometimes come on randomly and then goes for several weeks now. As it came on more frequently I thought the battery was dying so I replaced it two days...


If the battery light comes on while your are driving than the alternator is not charging. The battery light comes on to tell you there is a problem with the charging system not the battery. It is normal for the light to come on when you turn the key to the run position and then it should go out shortly after the engine starts. When the light is on check the voltage at the battery if you have less than 13 volts the alternator is not charging.

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SOUND LIKE ALTERNATOR NOT CHARGING BATTERY.BEFORE BUYING A NEW ALTERNATOR CHECK ALTERNATOR WIRES AND FUSE.IF YOU HAVE TO REMOVE ALTERNATOR.TURN OFF RADIO BEFORE REMOVING NEGATIVE BATTERY CABLE.SO YOU WONT LOSE PLAYING CODE.

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