starting problem

Have you given any thought to the starter solenoid? Check the start terminal on the solenoid for voltage while trying to crank the car. You should see 12 volts when the key is turned to the start position. If the voltage is there, replace the solenoid. If not, go back to the ignition switch and check there for the same thing. If you've got it at the switch, but not the solenoid it's a wiring issue between the two. I can't remember for fact if there's a fusible link on that circuit and I don't have a diagram handy to double check.

Yes there is a fusible link. I'd be checking the solenoid as well.