So i am trying to figure out whats wrong with my 1990 240sx. here are the details


so i'm coming home the other night and all of my lights go out all at once and then the engine dies. i figure its the alternato no biggie get the car pulled to the house and work on it in the morning. i changed out the alternator and damn it it still acts up. i can't rev it past 4500rpms and evertime i turn on the headlights the radio cut off and the engine dies. wtf does anyone have any ideas or has this happened to anyone and what is the fix???? Please!!!!!