[markwb]

Dave, It could be a failure in the ignition switch itself. When you take the ignition switch from run to start nothing happens, but all accessories are operating, correct? If you can locate the leads associated with the ignition sw. that "close in" to engage starter motor, you'll need to take a multimeter in the resistance mode to check continuity of that closing ckt. On the other hand it could also be the VATS security. Is there a resistor pellet embedded in the shank of your ignition key? If so, clean that up real good, then try. VATS will inhibit the startring ckt if all conditions are not set (ie resistor pellet in key not conducting) Those are just a few things that I could think of off the top of my head. Clean the battery terms, the battery leads to the starter & solenoid, both ends etc.