Last week went to start the car and the starter kept engaging. Turned off the car, starter kept running. Neg battery cable started to smoke badly and it used the 2nd ground wire as the ground and burned all off the insulation off . Had to disconnect the neg cable to get it to stop. Crawled underneath and saw the neg battery cable was not connected. WTF. The bolt on the timing cover was snapped and the cable was just hanging. Replaced the neg and positive battery cables. Connected the neg battery cable to the lower A/C bolt. Bought a new motorcraft solenoid. Battery seems fine and fully charged. Car starts and runs fine for a week. This morning go to start it up and starter hangs up again. Turn the key off it keeps running, Disconnect the purple wire at the solenoid and it keeps running. Did not replace the ignition switch. The car actually restarted but in the midst of it all cannot remember if it did so before or after I pulled the purple wire. The car eventually stopped but did not have to disconnect the neg cable. My thoughts are the starter is the problem and the bendix drive is shot? I can replace the ignition switch but again when I pulled the wire off the solenoid it did not stop the starter from engaging, Just went out and the the car started up fine so apparently this is intermittent.