Battery light on tested bat and alt both good
The alternator can check good,but it may have a blown diode in the alternator,and causing the light to come on,the test may not catch the flaw,so think about it,it will get worse,if there is not a drain on the voltage system,there will be.
If the light is on and the alternator is good then you either have a short to ground in the wire that runs the charge light or there is a diode in the alternator that is bad.The alternator will test good with a bad diode if it is only tested for the voltage it reaches but if you were to check the amperage output it would be down from it's output rating.
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