Why does my 2015 Kia Sorento keep burning alternators?

I suppose I’d start with checking your ground.

I have seen an alternator on a Sedona get fried due to a valve cover leak. Whole side was covered in oil, refused to replace alternator without valve cover gaskets.

Another possibility is a bent pulley somewhere, causing the belt to put stress on the alternator pulley.

If nothing is actively leaking on alternator, test battery and replace alternator with OEM.

Find out if it is PCM regulated and check all alternator data on scan tool.

If all good, start load testing the wires on the connector.

Peel back alt to battery cable insulation looking for corrosion at the ends.

Something is wrong with the ECM. Have it scanned with a good scan tool and look at the output of the alternator. Make sure it isn’t overcharging. I would bet there is an issue with the ECM.

Put a fusible link in before changing alternator, my a/c compressor was causing the issue with mine.

First, I would make sure it’s not the battery causing it to fail. Have the battery tested. Also, most vehicles nowadays require OEM alternators since aftermarket electronic parts don’t work.