Electrical replaced module, battery, 4 alternators, new fuse box, ground wire

Hello, my son passed away and my oldest son got his car, it’s a 2016 dodge dart manual transmission. Started having display issues, windows not working, door locks etc..put a new battery, then computer module, then Altenator, new battery , 3 more alternator, ground wire and new fuse box. Costing thousands, about 2 weeks after the fuse box n 4th alternator and now his battery light just came back on again and this is how it begins,,, any ideas ???? The car is costing tons of money but it’s my sons little brother whom they were super close. Help please and thank you