93 lesabre won't crank

I have a 93 that won't crank or start, the security light stays flashing while you try (all the time key is on). I have bypassed the starter and it will start and run for 1 second. I have checked all fuses and relays. I tryed a new key but didn't help. I have voltage from the key switch when you test with a meter. Any help would be welcome.

It broke the VATS wires at the ignition switch. You'll need to replace the ignition switch or jump by-pass the VATS system with the correct resistor.
See this forum (or the Park Ave) for more information.