The fuse box is under the seat. Check that first.
This should help:
https://www.buellmods.com
The battery you bought cannot be some Wal-Mart 200CCA junk. A 220CCA battery from Yuasa, Deka, or many other quality brands is required for your bike. And make SURE the battery terminals are on the correct sides, hooking up to reverse polarity will make the fan run (as a clue) and cause other issues (obviously).
Also, if you went with an LED option for the turn signals you will either need resistors for them, a new flasher that will work with them, or perform the "zero dollar flasher mod" for them to blink correctly.