I have a 98 cadillac deville d'elegance with all kinds of electrical problems-where

do I start? This car has all the bells and whistles and right now they're all malfunctioning. I had the main computer (forget the acronym for it) replaced a year ago, and got a new battery 6 months ago-the positive post on the battery had stripped out and wasn't keeping a good connection so until I figured that out I'd have to push on the post a bit to get power the to car. The other day I had the headlamp relay burn up-literally-it melted. Now when I try to start the car everything just starts flashing and going crazy, it sounds like my electrical is coming through my stereo system. I don't know if this is a result of the battery issue or if the wiring harness is just done (I'll sell it before I replace that). What are some other things I should check before I take it out back and set it on fire?
 
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