Question about 2002 Kia Optima

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Battery light shows on alternator after installing a new alternator and new battery

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Check and see if you have an alternator fuse. Sometimes that fuse snaps and your first thought is the alternator is no good and replace it, and still drain the battery because its not charging. There is also a possibility of a defective alternator.

Posted on Jun 20, 2009

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Posted on Jan 02, 2017

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2012 Grand Caravan. How do I turn the battery light off after installing a new battery?


Test the alternator. The battery light is for the charging system. Once the charging system is working with the engine running, the light should go off. If your light stays on with engine running, the alternator may need service or replacement.

To test the charging system, just put a voltmeter on the battery with engine running. The voltmeter should register at least 13.5 volts- alternator is charging. If you only show battery voltage with engine running, like 12.2-12.8 volts, the alternator or charging system is not working. The battery light should be on to signify this.

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2003 bmw x5 4.4 battery light stays on


Brother Mark, changing the battery with a new one being done won't make the light go out, as you noticed. Light is still on so you changed the alternator. Good, but the battery light is STILL on. This only means that the charging circuit from the alternator is not working in the voltage regulator or the wiring is not connected properly to the alternator/regulator. A new battery will show over 13 to 13.5 volts not connected. An old battery will still show 12 volts and still be weak or bad. After connected and engine running, the system will show at least 14 volts because alternator/regulator is working properly, using a voltmeter/load tester connected to the battery. If after replacing the battery and alternator it is still reading 12 to 13.5 volts, it is not working and the light will stay lit on the dash. You may have purchased a faulty alternator if the system tests out this way. Have your system checked with a volt meter or load tester bit be sure all the connections are proper and clean.

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If the battery light is still showing then there is a good chance your alternator is not charging properly. The battery light should reset on its own if everything is in good working order.

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Wouldn't be a fuse, but it seems as if the alternator is still not putting out normal power, or else your battery has a problem taking a charge. Better have the battery tested for a dead cell. also see what a voltmeter says about alternator output now. If you have an electrical problem in the wiring somewhere or in the alt. charging controls, then possibly one or more of the diodes in the alternator may got burnt out. That means the alternator puts out less power.
On some newer cars, the engine computer, pcm, controls the rate of charge of the alternator. So you have to be careful diagnosing -know how your system operates. That's why mechanics always ask for year, make, model, and engine size if applicable.

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Disconnect the negative battery terminal while the engine it's on if the engine doesn't maintain on your alternator it's bad

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Battery light on.. new battery installed..still on


The Alternator may not be charging properly.
If you have a handheld voltmeter, put it on the battery when the engine is running, it should show 13.8 volts if the alternator is working.

You can take your alternator to autozone and they will test it for free

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Could be your alternator. If you can get it started again. Try to have the alternator checked out.

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get a volt meter set it on dc scale start your engine .take meter hook it to battery it should be 13.5 to 14.5. it shouldnt go over 15. if it goes over 15 volts your alternator has a bad voltage regulator. take it back get you a new one.

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