Originally Posted by brocobilliam

i have a 1990 bronco. when i turn the ignition key nothing happens. if i hook up jumper cables the electrical system will come on but the truck will not start. a rough, loud, sort of grinding sound is heard when i turn the ignition. i disconnected the battery and hooked up the jumper cables and the same sound was heard so i know it is not simply a dead battery. any ideas as to why it will still not start?