my thoughts are a back ignition switch i have two cars that had similar problems. take the wire off the back of the starter, take a jump wire from there to battery, to test it. be VERY CAREFULL to just touch battery with other end to start it.(IT WILL SPARK AND GET HOT FAST, NOT TO MENTION WILL BURN UP STARTER IF LEFT ON). If it starts then its your ignition switch located in stearing column.