i had smilar issue with my 99 mitsu mirage, changed alt, and battery, and still had problems, turned out to be the voltage regulator. To test use a voltmeter and if the reading is below 13 on a new battery and is fluctuating then it should be the volatge regulator Try changing the belt i just had the same thing happen to my 03 rs i change both belts and then everything turned out fine after that
Voltage regulator or loose wire.
Most likely the problem is your alternator....the battery light actually does not monitor battery condition, only the charging system. I'd check the voltage regulator and the fuses first. The fuses are the cheapest fix and the voltage regulator will run about 25% less than an alternator.
The ground cable, on the battery may need to be tightened or cleaned. The alternator voltage regulator may need to be replaced.
you may have a bad battery or a bad voltage regulator
Bad alternator not charging battery? Bad voltage regulator? Blown fusable link?
The vehicle should ave a voltage regulator. If the battery and alternator are good then the regulator is most likely bad.
does the kia have a remote voltage regulator
Defective alternator or internal voltage regulator is bad.
On most vehicles today the voltage regulator is built into the alternator. If that is the case then just replace the alternator. If the voltage regulator is external on your vehicle then replace the voltage regulator.
either the alternator or the voltage regulator are no good.may also be a bad battery
it could mean that you have a loose battery cable that needs to be tightened