2000 jeep cherokee brake light diagram

SOURCE: wiring diagram

Try this link http://autozone.com/servlet/UiBroker?ForwardPage=/az/cds/en_us/0900823d/80/15/3e/8f/0900823d80153e8f.jsp

SOURCE: 1989 Jeep Cherokee - Electrical Problem - horn, brake lights, blinkers, radio/cd...

There could be a fusible link under the hood off the starter relay that is burnt out.

SOURCE: 2000 Jeep Gr. Cherokee 4WD 4.7L under dash fuse diagram

If you still have the pop off cover for the fuse box the amperage and position (number) along with the purpose served by each fuse is stamped on that cover.

SOURCE: 2000 jeep cherokee sport fuse diagram

unfortinately the fuse box is under the hood and there is no panel inside the 2000 cherokee or diagram, i had to buy an online manual to find out what fuse went where for my jeep but its not with me. You can just pull the fuses out one at a time and look at them - I know its a pain. It might be your window controll switch - mine is bad as well. It is a common problem for these cherokees especially over 100k, they wear out - I initally thought it was my fuse as well because the lights in the window switch didn't light up anymore - but it is my switch.

SOURCE: 2000 jeep cherokee sport fuse diagram

Likely you are looking for a 30 amp circuit breaker...(Looks like a small rectangular metal fuse) But...if the power door locks work, i don't think that it's bad (serves locks & windows) My diagrams show a bunch of diodes and resistors inside the master (drivers) door switch, but I've had a few apart and never saw any. (embedded?) Personally I don't see anything that shows me reliability built into the switch...It's a really "iffy" design (one in my niece's Jeep only works when the sun shines on the drivers door) There is also a control module associated with the windows but I've never needed to replace one and the manuals never tell you where they are!
Check power at the switch and check harness where it goes through the rubber boot between the door and body. at least 80% of problems I've seen are either the switch or that wiring. Wires can be spliced and you can get a decent used switch at most scrap yards.
Good luck...glad they aren't stuck down!!!