Sounds like you could have 4 or 5 different problems. As far as the test your brother did I am not sure what test that was. I think the normal test is to remove each fuse one at a time and "replace" it with an ammeter (current meter (multimeter)). Then you can see exactly what current is bieng drawn by each branch. This test is done with the battery connected which is why I am not sure this is what your brother did. The trunk light is one possible cause and there are many others. Could be a bad alternator. What is the condition of the battery? That could be contributing. The other problems you have could be related or not. Hopefully some others with more specific knowledge on your model will chime in.

Mike

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1998 C230 330,000 miles (currently dead of second failed EIS, yours will fail too, turning you into the dealer's personal human cash machine)
1988 F150 144,000 miles (leaks all the colors of the rainbow)
Previous stars: 1981 Brava 210,000 miles, 1978 128 150,000 miles, 1977 B200 Van 175,000 miles, 1972 Vega (great, if rusty, car), 1972 Celica, 1986.5 Supra