Got a 73`Z. When I turn the ignition key from the lock position the engine turns over and starts. I then turn it back to the lock position. To turn it off I turn quickly to off. The actual start position on the switch doe`s nothing! Bought another switch, same situation. HELP!!!!!!!!!!!!!!!!!!!

It sounds like your lock tumblers are worn out. If you only replaced the electrical part of the switch!

Will