Hi Zumi,
I think you have a short between the brake light circuit and the rear compartment (room). To be more specific, I think the hot wire going from your break light switch
is shorted to the hot wire to your rear compartment. That said, you can forget about any wiring at the front of the vehicle. It's likely at the place where you did the repairs at the rear door.
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Something is causing a "backfeed" in your wiring....
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I think SABL hit on it in his first post.
To find the short, start at the brake light switch under the brake peddle or at one of the tail lights. Notice the wire colors, they probably don't change from switch to tail light. Try to follow the wire from there toward the rear compartment. It probably enters into the same wire harness with the room compartment bundle. Try to follow that bundle looking for places where they can be damaged and shorted together (again, most likely place is at that door where you did the work) You should take that work apart and take another look. Here are a few pointers on fixing that mess.
When wires are broken or cut, use butt splices and crimp tool to reconnect them. A butt splice is a short straight tube with insolation on the outside and a small metal tube inside. Strip a short section of the broken wire and slip it into the butt splice and crimp it. Strip the other end of the broken wire and slip it into the other end of the butt splice and crimp it. Pull the connection to make sure both crimps are good. You can get but splices at Walmart or any auto parts store. I saw some today when I was getting my oil changed. (I quit doing my own oil when I found out it was about the same price to get it done)
On using black tape (which unravels when it gets hot), tape bare wires with overlapping winds of the tape, being sure to cover the start point such that it can't come loose. At the end of the tapeing area, leave about 6 to 8 inches of tape past the wrap. Press the sticky sides of this extension together leaving the length such that the unsticky part of the tape is on both sides of the results. (an unsticky extension that can be tied like a thread, or cord) Put two half hitches on the end of the taping. (a wrap around the work with the end slipped through the loop and pull tight. Do this twice). At the end of the last half hitch, tie a knot into the remaining part as near as possible to the last half hitch and cut any excess off. This will give you a taped area that will not come loose when it heats up. You'd be surprised how many folks don't know this trick, but now you do.......or maybe you already knew.
The short is between hot wires, which makes it a much easier problem to find. Ground problems are normally the hard ones to find.
Hope this helps.
Best regards,
Mack1