I have a '99 Passat with the 1.8T and auto trans. that does not always crank over, when you go to start it. Most of the time it cranks over and starts just fine, but there are times when you turn the key to the "start" position and nothing happens. Sometimes you have to turn the key back and forth a few times to get it to start and other times just holding the key in the "start" position for a few seconds and it will start.
I've checked the starter and everytime that I applied 12 volts to the terminal 50 at the starter, it worked, but if I go back to start it with the key it goes back to random cranking. I removed the ignition switch and bench tested that with an ohmmeter and it works everytime.
Do I have something going on with the Starter Interlock Relay?