i have a huge problem with my electrical system....its a 90 5.0 covertible...when i turn my headlights on, my dash lights go on and everythings fine, as soon as i turn my windshield wipers on, my dash lights go out except for my two turn signal lights (that aren't blinking) and the light that means my brights are on....my windshield wipers freeze...my horn wont honk....and my tachometer doesnt read.....then itll quit when it gets bored i guess and everythings fine.....i know a wire is grounding out but im a 21 yr old girl and even though i love my car and try working on it...its hard....any help? please