I replaced battery in 2005 Kia Sedona, still no power to anything.

The constant power comes in from the battery to the power distribution center.
https://stickerdeals.net/wiring-diagram/2005-kia-sedona-wiring-diagram/
These diagrams may help you . Possible that while adding your stereo you shorted a fuse.

I don't think so but give an auto parts store or Kia to find out for sure.

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how to replace an alternator on a 2005 kia sedona

It's normal for belts to loosen up a little after installation. I'd check the belt and re-tighten until there's no slack. A slipping belt would certainly cause the issue you have. Hope this answers your question. Best of luck!
Greg

This is the KIA tech site. Free to register and use. It lists the repair tech manuals, Sevice Bulletins,Trouble Code identifications, How-to's, and troubleshooting guides the factory trained repair guys use:
http://www.kiatechinfo.com/index.asp

AutoZone will read trouble codes for free

yes it will if you need anything else go to collisionrepairadvice.com its worth it