They ... replaced ... the ... timing ... chain for an electrical problem?!? I hope they didn't change you for the work (no pun intended.)
What's next, replace the muffler b/c the horn don't work?
Bad alternator. Wait a minute ... are you SURE they replaced your timing chain and not your serpentine belt? Even that's a stretch (pun intended.)
Finding a short's NBD. Find another Sonata and use an ammeter in place of each fuse to measure and compare the draw/change, one circuit at a time. No doubt there's one that's WAY different. The drain lieth within that circuit.
I hear and I forget, I see and I remember, I do and I understand. Co NF ucius