electrical problems can be a real bear.
hopefully you have or can borrow a test light and a multi meter.
do you have a haynes repair manual?? if not, is there a library nearby? the reference section should have the manuals as well as a book about auto electric trouble shooting.
they will explain (better than i can explain) how to test all the bits that make up an electrical system.
It sounds like something is trying to draw too much electricity through that circut
(has any one installed a stereo system or other electrical accessories?) or maybe,possibly, a wire is has insulation pinched or rubbed through and it could be "grounding out"
some times when we can't figure out what the problem is, we figure out what the problem IS NOT and see whats left over.
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