I think i have a serious electrical problem with my civic si. I went to turn on my headlights one night and it caused my radio to short out and my door locks to stop working,does anyone have a clue what it could be?

 

had you been running the stereo or something will the car turned off for a while? few hours of that will drain the battery pretty good

 

Not at all i even went and got it tested and it read good.