My hypothesis is that your ignition switch is bad, because of catastrophic loss of the starting system, warning lights, dash lights, etc. This is just an educated guess. So wiggle the ignition switch key and play around with it and see if anything happens. If that doesn't work, take the switch apart and examine it. If this makes sense to you, then look at this link first:
http://techauto.te.funpic.org/ignitionswitch.php
If that didn't solve the problem, then follow the steps below:
Are battery terminals clean and tight? Have you checked main engine grounds? Have you checked the fusible link? Take your multimeter and start checking voltages from the battery to the main relay. One main flow is from the battery to the under-hood fuse/relay box; to the ignition switch; to the under-dash fuse/relay box [ACG (S) fuse, No. 24, with SRS, or No. 12, without SRS]; to the main relay, gauges, alternator, and ECM. Double check that the ACG (S) fuse, in the under-dash fuse/relay box is good. This is an extremely important fuse. Make sure alternator is good, particularly the voltage regulator.
Another major flow is from the battery to the under-hood fuse/relay box, to the ignition switch, to the clutch (A/T) interlock switch, to the starter solenoid. Check battery voltage at the starter solenoid. Make sure the clutch (A/T) interlock switch is good. Basically, if the engine won't crank, check the battery, alternator, fuses, or starter solenoid for power.
Linear Mode
