Turn key to start car. Lights/Radio work normally. At final twist of key when you would expect to hear engine crank over........nothing. Battery removed and tested as fully charged. Starter removed anticipating it was bad but it too bench tested just fine. Starter relay I'm thinking? It checks out electronically just fine. Battery connections look clean. Ground in trunk looks clean. Positive under hood looks clean. The only item I can think of is the Ignition switch? A bit of a mystery so any ideas would certainly be welcome. thanks so much