[Bill Hanlon]

Make sure the transmission is in park or neutral, the parking brake is set and the key is off. Now make sure again.

Use a screwdriver to jump the S terminal to the large terminal on the solenoid that the battery cable connects to.

If the engine cranks over (it may even start until you remove the screwdriver) the problem is in the circuit from the ignition switch start position through the safety switch on the shift linkage to the S terminal.

If the engine doesn't crank over, but you can hear the solenoid pull in and stay pulled in the problem is in the starter or the solenoid.

If the engine doesn't crank, but you can hear the solenoid clicking many times, the problem is either at the battery, the battery cables or bad connections on either end of the battery cables.