[s-cars] Ignition switch?

[Nathan Belo]

Started the car and drove 10 minutes about 5 miles. Car sat for 5  
minutes and wouldn't start. No clicking when trying to start. Tried  
jumping battery to no avail. Battery seems fine. I replaced voltage  
regulator 3 weeks ago. No alternator light or any other warning  
lights. Fuel pump is 100K miles old (218k miles). Ignition switch?

92 S4
Nathan Belo
Seattle, WA