electronic problems

i have a 2000 xterra with 98k miles on it and i have been experiencing all sorts of electronic failure- started with radio speakers shorting out, (going in and out), includes dash light failure except odo, tail lights out (break lights fine), interior lights & radio lights blinking when hazards and signals are on, signals blowing their fuse when left on for more than 30 secs or so, warning buzzers are out, and left turn signal gets stuck, etc. i changed the fuses, and had the connections cleaned-all worked fine for 2 days, one by one it all happened again. anyone else have problems like this, is there a simple solution i am missing--all fuses are correctly installed. HELP! i don't know anything about cars and i was quoted $95 -$245 for a diagnostic test which i know is b*llsh*t.

desperate.

Go to Pep-Boys or Auto-Zone or the like, and they will run diagnostics tests for free.

There is alot of posts about this type of thing happening.........all ya gotta do is search...........!!!