For the beeping sound - it's probably your CTIS. There's two ways of shutting it off.
1) Pull the fuse under the dash (not next to the CTIS pump). That will kill power to both the switch and the beeper.
2) Reach under the dash to the right of the steering column and there's a piezo beeper. Unplug it.
As for the electrical problems - I highly recommend buying the 99-00 Service Manual CD. You need section 12, which is the electrical.
This link will give you at least the fuse block schematic and what it goes to:
http://www.flashoffroad.com/electric...rFuses2003.pdf