u/MathematicianOld2154

So I bought this car secondhand from someone I know the car was slightly modified prior to me purchasing however, I was told it was not anything serious. But my car literally just wouldn’t turn on. We realized the battery bolt was warped so we replaced it and the car turned on but now nothing works beside the radio and the sun roof, Mirrors won’t unfold. No interior or exterior lights working. I need to know what could be the problem.