My fuse is blown for my brake lights where can I find the diagram for a 2000 Hyundai sonata

there's a switch under your dash hooked up to your brake peddle

use a scanner to reset the ecm program as removing the battery sometimes corrupts the CPU settings

I would recommend you take it to a shop and have the alternator tested, or take the part off the car and have it bench tested in a store.
You may also have a bad fuse or fusable link between the battery and the alt.

There is either a blown fuse or a short in a wire. Get your owners manuel out and search for the Fuse diagram and replace them and see if that works

YES -- process of elimination. Obviously there's a short circuit in the Brake/Headlight circuits - right? Blown fuse(s) is/are evident of this -- would you agree? Which fuse(s) is/are blowing? An analysis tells you that the only time a fuse blows is when the headlamps are turned on -- correct? Otherwise, brake lights work normally -- right? OK. Head lamps have relays which turn them on. Here's a wiring diagram of the 2000 Hyundai Sonata (NOT the Jeep Grand Cherokee)
It would appear the problem is with one or more bulbs or sockets or both. As you many notice, there are no connections between the headlamps and brake lamps except the parking lamps (which share the bulbs/sockets)
When the headlamps are turned on, so does the tail lamp relay. As you can see, these bulbs/sockets are 'DUAL' filament to ground (series-parallel circuit). Just a guess here - the short is in one of the lower rear brake/parking lamp bulbs/sockets.... just a guess.

There was recall for the 2006 and 2007 Hyundai Sonata Brake Light Switch assembly. www.promanuals.net

try the brakelight switch, it is right near the pedal above the footpad

I have a1999 Hyundai Sonata Headlights wont come on. Is this in the fuse panel under dash?

there is a tsb for the brake switch in 06 sonatas. it must be adjusted or replaced by dealership. is your check engine light on, if so its probably code p0504