I have a 1966 Mustang that I recently purchased that will not start. I have replaced the starter and starter selinoid. It will not start with the key, but I can cross the seliniod with a screwdriver and it will turn over a few times, then nothing. The engine had been just put in when I bought it. What can it be? Does the alternator give fire to the switch to turn over? Could wires be crossed?