1993 bmw electric problem, please help on 1993 BMW 325i

were is the ground wire located at? i have no power, windows radio, lights, ect. please help

Asked by for the 1993 BMW 325i
other than the battery, ground wires are located from one end of the car to the other; literally DOZENS of them. without a wiring diagram and a good digital inductive meter, you are lost. suggest a local BMW specialty shop.