where is my car ground2001 regal

I guess you are asking because someone said you have a bad ground. Not that simple, The battery is grounded to the engine block and there usually ground jumper from the block to the chassis. Various electronic devices have a ground wire and at some point that ground wire is attached to the body, Lets say it is your radio....you need a schematic for your car and using that you must find where the radio is grounded.