Kia Forte 5-Door - Trouble following service

I have a kia picanto automatic 2005 suddendly after a big service battery and break symbols (red) flickered on the dashboard. I replaced the alternator and after about 40 kilometers It started again , both light flickering. What do I do.
Your output will be highly appreciated. (ps i had to check another car model below cause picanto was not on the list.

The Check Engine Light isn’t lit up?
If it isn’t lit up, my only guess from afar is that perhaps the Body Control Module is bad.
But, rather than continuing to “throw parts” at the problem, I strongly suggest that you have it diagnosed by a mechanic who can examine it firsthand.